Re: Where to buy blank chassis ?
An old caravan will yield as much sheet aluminium as you are ever likely to need - perhaps a little on the light gauge side but easily reinforced in fabrication. You can cut it with tinsnips, fold it by hand between a couple of bits of Dexion, and pop-rivet joints.
Otherwise, discarded PC cases make very tidy enclosures and/ or chassis with minimal modification.
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