Here is a thread that might help. I made 2 overhead racks out of aluminum. Bought some clamps and then cut and screwed the pieces together. Then put some padding over them and used some bungie cords to secure them. They work awesome and cost about $100 a rack. I can't upload pictures but if you want i can emails some to you want.

https://forum.moomba.com/showthread....-wakesurf-rack