[Bryan A.]

Fellowship brings up a good point. Without the bolts it seems you are relying on just the outer skin to hold the weight of the motor. I would say bolts with large plates or washers would be needed to tie the whole thing together. After all a transom is basically layers of wood or foam, glass, and resin. The outer skin being just that, a skin. I think Strick posted a while back about using plates and washers to secure his home made bracket.