I did a couple of conversions but mostly just replaced the rear wheel with a built in motor. It is a dirt cheap mod and it is very modest optics wise. Unlike other options. In general it is very advisable to look for spots on the frame where the power of the motor will be attacking. Most parts are designed to handle stress just from one direction only. That is why I am not a fan of conversions that utilize front wheel motors and/or big guns like 500W+ motors - even for the rear wheel.