I've always wanted to see about 6 or 7 boxes inside boxes. Each outer layer box would be semi transparent. Or in other words, the mesh would have 'holes' in it so you could see the layer beneath thus adding depth rather than using a texture trick. Course, lighted indexed colored high resolution textures are still a must.
I've never seen a great borg ship. Hope you can make one. Plenty of good ones, but nothing great.