[Ikestaa]

Personally, I think if your going to spend thousands on a motor, you should have the safety equipment to stay alive and enjoy it. Your setup may be sufficient, but the 4x4" plate with I-bolts would distribute the forces much more evenly. The forces generated by the weight of a human body going from as low as 30mph to 0 in fractions of a second are pretty amazing, and could do alot more damage to fiberglass than often thought. I am not trying to be negative, but it is just my opinion.