What an absolutely delightful idea
This was brought to my attention by the wonderfully active
Dannage .
I certainly applaud the work going into this and it looks absolutely professional and reminiscent (obviously intentionally) of that one enormous poster that is floating around the net of space-boats and their sizes. Upon it's completion, I absolutely encourage you to make a bona-fide poster of it to sell, I am sure it will be a big hit with starmade fans; I would definitely buy one for Lightweave's offices.
I could just toss all my ships at you, but I feel that would not be proper, so I'll link a couple here, however, should you wish to do so, please feel absolutely welcome to go to my community content page and grab the others, if you have personal preference.
Unfortunately these are also quite old. I should really upload my latest ship that I finished months ago, but i'm so busy these days.
Though not my personal favorite, people seem to like The Black a lot, so this is my first logical suggestion:
The Black
Rex IS my favorite.
Rex
The disciple Battlecruiser is more recent, and has a nice shape.
Disciple Battlecruiser
The Eidolon Battlecruiser is older still, but out of all of them, probably has the most different looking profile and contrast to make your poster look as nice as possible
Eidolon Battlecruiser
Good luck and again, awesome idea!