Nice build/project fella. A wee tip from modifying Avengers in my past is that you need to strengthen up the rear bottom trailing arm. That fantastic bit of engineering that the rear spring sits in has a lot of force on it when cornering hard and under acceleration. Its an easy fix, just weld a plate to the top part of it, transforming it from a open c section to a rigged square box. Then it will be strong as, making your car handle better and will not bend or flex. I bent heaps years ago and had trouble finding them then, can only guess they would be harder to get now.