Thanks for the input ajlapp, I think we'll take the advice to allow us to pull the motors out without banging at em with a flathead first.
Here is a picture of the mounting plate. Things circled in red are motor mounts. Things circled in purple are where the spacers go. The bit circled in lime-green are the two reductions for the gearbox.
http://s169.photobucket.com/albums/u...ntingplate.png
We ended up keeping the mounting holes the same dimensions as the TB so if things go south we can just bolt a pre-assembled toughbox on and keep on rolling.