Does anyone remember reading the Lost Era novel 'Serpents Among the Ruins'?
If so, you might be interested in this. I'm having a go at making a 3D model of the U.S.S. Universe. It's an experimental hyperwarp vessel that features early on the book. If you haven't read the book yet (and I highly recommend that you do) then I won't spoil what happens with the ship, but in the 20 years since the book was released, I couldn't find any images of what the ship actually looks like. Hence why I'm attempting it myself. The is another old thread about this ship if you want to read the background of it, which can be found here:
https://www.trekbbs.com/threads/serpents-among-the-ruins-uss-universe-nx-2999.101938/
The book only offers a brief description of the ship:
"On the computer screen, the Enterprise vanished, replaced an instant later by split screen images of Universe; a view from in front of the vessel sat on top, and a view from the side on the bottom. With a particularly wide beam and shallow depth, the starship looked as though it had been compacted top to bottom, and spread port and starboard. The primary hull, a narrow ellipse with its major axis running fore and aft, had no rise to it at its center. The secondary hull, another level, narrow ellipse, but smaller, connected to the primary hull directly, the forward section of the former lying directly below the aft section of the latter. A pair of thin struts, angling backward, connected each of the two warp nacelles to the secondary hull. The nacelles themselves were flat and wide, flaring out broadly from their midpoints aft. The two-hull, two-nacelle alignment suggested a resemblance to other Starfleet vessels, but departed dramatically from those other designs in execution."
So here's what I've come up with so far.