I'm not sure that there is any solid information on Nanotechnology in ME, though I do have a few thoughts on it based on what I see in game.
Firstly, one of the objectives of Dr. Chandenar's team onboard the derelict reaper in ME2 was to acquire and study any Nanotech they found. Husks where made using Nano-tech, and it was considered plausable for the Geth to have that technology until it was proved otherwise. There is also an Extranet meme about a planet thats covered in nanobots (widely believed to be false...)
On the other hand, the way an Omni tool minifactures things does seem very nano-techy to me, and I beleive there was some sort of nanotech invovled in Project Lazarus.
My conclusion, Nano-tech is not particularly advanced, but it is an active field of research and advancing at a reasonable pace.
Dunno if that helps Soshi, and it is just my opinion based on the (very few) facts about it we get in ME.
So no special ship designing for me? :'(
On a more serious note, that sounds like a fairly good idea about the ship Derv.
Looking forward to it Volt, I guess that also means you don't mind going for a brief ride in the gunship to were Nova is....