With all of the seats mounted, my version of the "fold and tumble" works out pretty well. I just have to finalize the latching mechanism for the rear seat and the rear seat mounting and belt mounting will be done!

I know I will have to devise some sort of latch or something to hold the rear seat up when traveling especially when I add the bars to mount the front seat harnesses to. When those bars are added and in place the rear seat when folded up will sit more vertical and will just fall.