I saw a post awhile ago, with measurements and diagram etc for making your own lower torque box reinforcements. Anyone have the link handy? I did a search and came up empty
I was considering making the torque box reinforcements but figured it wasn't worth it. The material cost plus hardware and my fabercation time added up to more than buying them. I bought some SMR upper and lower reinforments from ebay for less than $75 with shipping. I welded up the pieces inside the car to the floor pan to make them stronger yet.