I don't think I've seen a 3D model of sanguinololu. May I ask what you need it for? There's plenty of mounting trays on thingiverse, so you should be able to get mounting holes from them, or from the wiki schematics.
I need to know exactly where the usb socket/power connector is in relation to the board, and how high it is from the surface of the board - an accurate end elevation would suffice....