my rotisserie

I kinda flew by the seat of my pants on design,looked at various rotisseries online.The take are for lifting the car,will pin the main part when I get it balanced.Was thinking of putting a balance bolt on it like the auto twirlers.Most of it is made of 2 and 2 1/2 sq 3/16 thick tubing except the part with the wheels and the up tube is 2 1/2 and 3 in 3/16 tube