i think it its possible to do
lets imagine that its a steel fabricating firm building it
steel is about a third of the price it was last year, i got given the steel for my chassis but to buy from a builders yard would have cost me about £100. so lets say that they got it at cost £50ish or it could be left overs from other projects/jobs so that would be free then
if they are a steel fabricators then they will have the tools and equipment to build it so no additional cost there
if they are going to be building lots of them then i would imagine that they will have a jig made up for various sections such as the bottom rails and the top rails and then a jig for clamping the top and bottom together at the right distance, then just the simple job of attaching the uprights this would give you the basic chassis and i think that it could be done in a day or less
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