Blank regs are no problem.  As for the color scheme, it might be possible to release a light scheme and a dark scheme.  I'll think about it.
As to how I make the textures... nothing has been done with photoshop.  All the textures and mesh have been done in 3ds max.  Though I might use PS to add a bit of weathering here and there when finished.
I was asked earlier if this was going to run smoothly or not... so far all the textures are on just one 2048x2048 texture map.  I don't want to jump the gun, but I think I'll be able to do the whole ship in 2 maps only, which will mean a very good framerate and you should be able to have a number of them on screen.  My Galaxy class uses 4 2048x2048 textures, so each Sov will be considerably more GPU light than those.
Still haven't tweaked the impulse engines.
Here's an update.