Yes! It's only question of different support, shaft adapter and modified shifting link/cabling. I've insert a Volkswagen transmission inside a Smart fortwo...
From what I can read on Torqev site, a Warp 9 and a 1400A Netgain controller can give you good porformance, but can cause some overheating to the motor if use at high speed / hilly terrain for long time.
Other convertion used dual motor: http://www.diyelectriccar.com/garage/cars/286
About the battery, is they used 48/60 cells of 3.2v 160Ah or 48/60 battery of 12.8v 40Ah? Or something other?