I agree the toggle bolts could easily work loose during travel due to vibration.
I don't think the elevator bolts would get more than 2 threads of bite on the steel in the frame, and could pull out, rust out etc ....
The best bet here is the old fashioned way, where the bolt is the weak point and not the connection between materials.
I just finished my shell off and used 3/8th stainless with washers on both sides and a lock washer.
http://www.airforums.com/forums/f104...-111301-5.html
Todd