I am in process of replacing the (72 jimmy) inner/outer rocker panels, front pillars, and parts of the floor pan. How do I brace the floor/firewall before welding everything back together? Is there a certain way do it, or just eyeball it? I have searched and found a lot of useful info, but nothing specifically saying how they braced it. I am only doing one side at a time, the door is removed body mount bolts removed. I dont consider myself "skilled in metallurgical arts" so please break it down for me. Pictures and drawings will be even more helpful.