Hi Pete-
There aren't any documented rules you need to follow to have an EV conversion certified in Ontario. We thought having it certified before doing the conversion would simply save some hassle having to do a lot of explaining, so that's what we did. But it turned out the insurance company required an additional inspection anyway (since the original inspection had expired after 30 days or whatever it is, not because it was an EV).
That said, I'd take the vehicle to a mechanic you have a relationship with already, since they have a lot of lattitude to interpret the regulations and you want someone who will help you to make sure the car is safe, not simply throw up road blocks. I used my regular mechanic that I've been going to for several years.
You might want to ask on the Durham EV Association Google group for specific recommendations in the Toronto area. Their website:
http://www.durhamelectricvehicles.com/
Their discussion group:
http://groups.google.com/group/Durha...iation?lnk=srg