Screenshots of the Workshop provided
by Tau in: [79 Concerning Flight]

Holo-Leonardo's program is one of the objects stolen from USS Voyager by Tau and his forces using a special translocation device which beams or downloads the loot away. Among the items stolen are Voyager's main computer processor and the Doctor's mobile emitter. When after 10 days Voyager reaches Tau's planet, an away team is sent to each continent to try to trace and retrieve the most important of the stolen goods. Janeway and Tuvok go to the northern continent, to Tau's city. There, to their surprise, Janeway is greeted by Holo-Leonardo! He is wearing the Doctor's mobile emitter, which is how Tau has managed to activate him. Tau has become Holo-Leonardo's new patron, and has provided him with a modern 24th century workshop. The Maestro, who sees everything in 16th century terms and is unaware of his nature of being a hologram, thinks he was kidnapped and brought to the New World (the term for the continent of America at that time).

Holo-Leonardo's workshop, which is real as opposed to being holographic, contains a mix of modern 24th century items such as desk lamps, chairs and several unidentifiable devices (deliberately unidentifiable as far as the writers and producers of the show are concerned), and Holo-Leonardo's models and drawings which he must have produced or reproduced upon his arrival. He must have done so during the 10 days that Voyager took to travel to the planet, assuming that Tau activated him almost as soon as he had stolen his holoprogram.

looking toward the entrance, [79 Concerning Flight]

[79 Concerning Flight]

In the screenshot above, to the left is a model of horse, Leonardo drew many studies of horses and throughout his life was commissioned to construct three equestrian monuments none of which he finished - "the great bronze horse in Milan" at more than life-size (the Sforza monument) as mentioned by Janeway earlier in this episode, the Trivulzio monument which was to have been only life-size, and an equestrian figure. The latter was one of several models which Leonardo created for his last patron King Francis I of France. After Leonardo's death, Francis I dreamed of having turned into a monument after Leonardo's death. The one pictured via link dates from 1516-19, is probably the last one ever made by Leonardo, and is bronze, measures 24.3 cm high, and is located in the Museum of Fine Arts, Budapest.

Some of Leonardo's drawings of horses: 1 2 3 4 5 6 Nos. 1 & 3 Leonardo made many drawings as part of his preparations for the Trivulzio equestrian monument. Nos.2 Leonardo made many drawings as part of his preparations for the Sforza monument. No. 4 This is the closest in stance to the model horse seen on the table in the workshop provided by Tau to Holo-Leonardo. No. 5 This has, as well as horses, a cat and a representatoin of the battle of St George with the dragon. The note on the upper part contains references to the movements of animals. The page dates from 1513-16, and is part of the Royal Library, Windsor Castle, Windsor, England.  (Another Leonardo drawing of St George and the Dragon c.1512-13.) No.6 This drawing of a rearing horse dates from 1503-04, executed in red chalk and pencil, 153 x 142 mm, Royal Library, Windsor Castle, Windsor, England. It was produced in the context of the first designs for the main scene in "The Battle of Anghiari", namely the Battle for the Standard, in the two Venice sheets.

[79 Concerning Flight]
on our left is a model of the Aerial Screw seen in the Holo-Workshop here.

[79 Concerning Flight]

In the screenshot above, the drawing immediately to our right of the Aerial Screw model relates to the small round grey (metallic material?) object on the edge of the table in a later screenshot see it now, and its purpose is open to speculation as follows:

1. It might be a design for an ideal fortress possibly with a view to pleasing his new patron Tau (he later tells Tuvok that he visits Tau's "great fortresses" with him and so his interest would have been sparked by those visits).
2. It could be a design for an ideal church, as Leonardo was interested in both, in particular he like others of his time felt that geometrical symmetry and geometrical harmony were key to structural and aesthetic soundness.
3. It could be the design for a military weapon, but it does not much resemble the armoured vehicle that Leonardo designed and which is often deemed to have been the forerunner of the modern tank.
4. Personally, I believe that if the model is meant to be that of a specific Leonardo design, then it would be his Mausoleum design.

Below: Leonardo's drawings for a fortress, and two for the dome of Milan Cathedral:

Leonardo's "armoured car" drawing

"armoured car" mock-up

design for a mausoleum

Information about Leonardo's participation in the competition to decide the designer of the dome of Milan Cathedral is on this page which is part of the article "Leonardo's Life".

[79 Concerning Flight]

In the above screenshots, the model seems to be identical to the one that can be purchased as a model kit from The Da Vinci Store, although when the episode was filmed that did not exist but must have been available from elsewhere.

The Da Vinci Store model kit (to purchase see Sources), and as seen in this episode

model kit - built - view from top

[79 Concerning Flight]

In the above screenshot is a Starfleet phaser, but also to the right of the picture a model doubtless by Holo-Leonardo of what has come to be considered the forerunner of the modern bicycle. That Leonardo designed the forerunner of the modern bicycle, or that he even made the drawing that gave rise to this belief, is actually a hoax, and who perpetrated the hoax has been the subject of much debate since the 1970s. The episode's writers and producers would (or should) have known that. Personally, I believe the bicycle model should not have appeared in [Voyager].

[79 Concerning Flight]

[79 Concerning Flight]

Above: A version of the globe to the left of the horse features as the quantum slipstream drive in Arturis' starship "USS Dauntless" in [94 Hope And Fear].
[79 Concerning Flight]

Also seen in the above screenshot is an articulated model hand as used by artists to pose a hand as a drawing aid. One is seen in the Holo-Workshop too.

[79 Concerning Flight]

Leonardo's map of the city of Imola (a Renaissance map)

if I recall correctly, the cone shapes are noted in ST:M as being purchased for next to nothing by Rocky Frie a buyer for the show - but that should not be relied upon until I can re-find the ST:M issue concerned to check
[79 Concerning Flight]

[79 Concerning Flight]

[79 Concerning Flight]

note the design of the windows
[79 Concerning Flight]

note the figurine by the bottom of the steps
[79 Concerning Flight]

[79 Concerning Flight]

the machine behind her glows red on and off, and is seen in entirety in the background of the last screenshot below
[79 Concerning Flight]

[79 Concerning Flight]

[79 Concerning Flight]

[79 Concerning Flight]

detail of underside of the table and the stool, the latter can also be seen in the screenshot below
[79 Concerning Flight]

[79 Concerning Flight]

[79 Concerning Flight]

note the chair detail - not apparently symmetrical
[79 Concerning Flight]

I do not know what the squiggly blue dangly thing is
[79 Concerning Flight]

[79 Concerning Flight]

Aerial Screw

The Dream Of Flight

"the great bronze horse in Milan" - the Sforza monument

map of Imola

Janeway and Holo-Leonardo in [79 Concerning Flight]

Screenshots of the Holo-Workshop in [79 Concerning Flight]

Janet's Star Trek Voyager Site