I don't have ventral schematics, but here are some of the relevant parts of renders by Jan Wehlack.
http://img.photobucket.com/albums/v22/Masao/Wehlack1.jpg (112 kb)
http://img.photobucket.com/albums/v22/Masao/Wehlack2.jpg (104 kb)
http://img.photobucket.com/albums/v22/Masao/Wehlack3.jpg (68 kb)
Hey, Andrew! I remember that project. You were working on a few of my ships, if I remember correctly.