Mater is right at home around here.
As far as the front halo bar... Early in the build, I bent up a "U" shaped halo bar that I intended to use at that time. The legs of the U would weld to the main hoop, and the squared off U would encircle the inside of the roofline. Then I planned to use 2 bars which would tie in this halo to the dash bar.
As I thought about it more, and looked at other cages, I decided that it was better to bend up some bars to run in 1 piece from the dash bar to the main hoop. These bars will be tied together with another dash bar, above the existing dash bar, and an upper bar near the top of the windshield. I will then use tubular gussets to strengthen the intersections of these tubes.
It will be similar to Tony's cage design in the Camaro and Gregg's cage in his Rampage. I am borrowing heavily from other good looking designs.
Steve.