Bolt in Harness Bar don't do it!!!

Here's another opinion from another "know-nothing"-

I think the design looks horrible. There's a reason NHRA mandates rollbars and cages with certain bars in certain positions. Though I realize this isn't a racing application, I'd still take a page from the NHRA and do it right with a main hoop and back tubes and door bars, then attach the harness to the cross bar. If you build it right, there'll be plenty of room for back seat passengers.

That POS "harness holder" looks worthless to me. Sorry for being honest, but those are my two cents.