Hi,
I haven't fully welded the chassis yet, but I clamped it on my table with small brackets you can find in any construction store, the one with a 10mm hole in the centre, at 30mm above the bottom plate. Then I bought threaded bars M10, and some M10 nuts. I cut the bars in pieces of 35-40mm, and put them through the bracket holes, secuted with nuts, just manually tighten. So, the lower point of the bolt is exactly 25mm above the building board, and this will hold the bottom chassis perfectly flat on the board when I'll weld... or at least it is what I expect. I have to confess that the idea is not mine, I found it on a web site, a guy who did it and was happy with the result. If it can give you inspiration, it is a cheap, easy and efficient way to keep the chassis flat when you weld.
I've tried to attach some pictures, but I don't know if it will work. If not, I'll try another way.
Cheers.
S.
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