I think the Insight is probably one of the best chassis around for converting to EV simply because of the aerodynamics and weight. I've been looking at the I-MiEVs, and soooooooo wish to rip out its drivetrain and put it in something massively more aerodynamic like the Insight haha.
If you want a good idea of the overall process of how to build the EV, I would suggest watching Ben Nelson's videos on how to build an electric car. It goes through quite a bit of the process.
Electric Car Instructional DVDs
Then, you can figure out the finer details here.
I also know a local guy who is looking to get rid of some GE brand 11" DC series wound motors that are apparently very nice (better quality and durability) than a warp 11 HV at a fraction of the price. This guy is a professional motor tester (works for Helwig Carbon, a brush manufacturer) and knows his stuff.