I am currently building according to the same principle. I bought a 120x50x3mm aluminium flat-edged tube for €9. The screws from the mast plate go through it. I have welded in additional tubes where the screws go through. This means that not everything has to be waterproofed and you can replace the battery. Either 12S2P or 10S3P
Weight housing 1060g total 4kg
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