Hi Max,
some good ideas there but straight up his first request was must be electric start,I can do that with battery leads running from the 4x4 existing battery. At least I can bolt the motor to the deck so that will be an easy access short B section belt that drives the cutter deck and the deck has an easy to get at A section belt running the 2 spindles. The fact the deck will be mounted out the back there is nothing above the deck so it is easy to access everything. I will just have to make up a belt guard to cover the belts. I think I will put a pair of zero turn type wheels on the back to help support the deck. Not a lot of money involved because I already have the deck and a Briggs electric start motor sitting here. I just have to get hold of a couple of swivel wheels for the rear of the deck and a bit of RHS tubing to bolt to the back of the 4x4