[phillyg]

I agree about bonding a larger plate to the wall. You'll have to find an adhesive that will bond to metal and the vinyl material. I'd use 1/8" aluminum. If you use bolts with nuts, you'll have to affix the motor to the plate first because you won't have access to the nuts. In the alternative, you could weld threaded rod to the plate and put the nuts on from outside. Another alternative is to drill the plate for screws, not too long because you don't want to go thru the wall.