Dean I would be tempted to move the two verticals at the back closer to their original position under the roll hoop diagonals as this provides a nice load path for the hoop that runs almost straight down and then ties the back of the car up to the bottom of the hoop. It's good to see that you have included gussets to help the load path but I would have thought if you moved them outwards you could get rid of them and also the centre bar betweern the two and save a bit of weight.
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