Why the hell would you do that! Call unitec and put an at400 belt drive on it. Bolts right in without drilling a single hole. No inspection, no additional wiring needed. Seriously easy. They sell it as a package.
They sell the AT400 upgrade for I-motion 1 not I-motion II plus this is a heavy S/S door and the AT 400 will not hold up over time. Unitec was able to find me a new I motion II in their boneyard. I should be back in business soon.