Get a tubing bender from harbor freight and do it your self... lots of triangles and that pic posted would do more harm than good in a roll over!

Join a rock crawling site and reseach tubed buggys till your sick of it and have changed your mind about the whole idea, then you'll atleast know what will work and what won't by that time

I've been thinking about back halving my big truck and doing an 8-point

You could get away with a 6-point and it would have to be fabed one off, if you don't plan on doing it yourself which means $$$

In my harley I'll do a 6-point when the time comes