having to start right back from beginning but shouldnt take too long as most of it is still in my head. this design so far is using 80x80x5 and just the support beams for rails is 100x100x10. also thinking of making it half weld half bolt on and have the main rail support bolted onto 10mm plates rather then welded to the legs if this makes sense but then i dont want to over complicate things.

this is mine now

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this is how i think i should do it

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