Have been hanging an outboard off the stern since 1994. Beefed it up with plywood backing and 2 layers of roving, leaving the backstay chainplate exposed to air. Have been in 30 knot conditions and (embarrassingly) hit the beach one time. Stern is still intact with no evidence of stress (cracks, distortion, etc.) 2 stroke Mercury 5 (48) lbs and 2 stroke Evinrude 6 (60 lbs.). Checked by boatbuilder (Wilderness, Moore) and engineer. Not recommending you do this, just saying. Wish I hadn't Sikaflexed the plug. Will take a special tool if I ever want to undo it.