I see your main rollbar diagnol is the now preferred one piece. Since you are 75% finished, this is a leaf spring or a 4 link rear chassis, because your rear down bars are not to the rear?
I also like personally but seldom see it, but a low as possible bar tying both of the bottom legs of the main hoop together, any side impact would without any lower bar would depend solely on the chassis sheet metal floor with a large DS tunnel in the middle, and a bent OEM crossmember, not a lot of protection for the occupants, IMO, and easy to install this additional bar.

Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.