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Message: <blockquote data-quote="wash" data-source="post: 1137655" data-attributes="member: 18190">I know I won't ruin anything because I'm going to use a test mule.It won't be expensive because steel is cheap.It will take time but that's how I want to spend my time.I expect seam welding to show a small increase in rigidity for a miniscule weight increase, the rockers with weld on jacking rails and an upper extension might not show a huge increase until I add reinforcement to tie the rockers in to the cowl/front frame rails and rear suspension pickup points.  After that and a k-member brace, I think it will be difficult to find much improvement without adding a lot more structure so its all about finding the best balance.  Once I find that balance, I'll remove any dead weight I can find and try the foam just to see how much it can do.  After all that I'll do it again on my keeper and scrap the mule.Hopefully the result will be a description of what works to stiffen an SN95, how much it weighs and good deflection figures so that the next time someone asks how to stiffen their chassis anyone who has read the thread will be able to say xyz reduces chassis deflection by n% and Griggs does??? (Note the ambiguity there)</blockquote>