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You don't need anything too special to run your motors from the bottom. I should know, I have my Prusa 'the wrong way up'! However, I use some short NEMA17 motors - Z axis doesn't need much power anyway - an extra bar at the bottom for the motor mount, and the Sells Z-rod clamp at the top. Also, bars at the bottom need to go over the bottom vertex rod. See here: http://dl.dropbox.com/u/709557/Reprap/IMAG0106.jpghttp://dl.dropbox.com/u/709557...

At least I don't have to worry about pushing down on the extruder breaking the z-motor-couplings!