Glad to be of help, there is a bit more waffle about the weld-on mounting points on my old Spyder build thread. They are what the 7 and lo-cost types use and I mounted mine in the same way as they have to for the IVA. I can see where you were coming from with the cross bracing etc. as I'd originally started off thinking the same as you. But the strength of correct thickness steel box with those threaded mounted points welded on and the then forces being spread over the four points is more than adequate. As you say, more than that and its metal squishing time!
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