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Trying to price this up to build an enclosure for my CR-10 4S (400mmx400mm). Cabinet will be approx 2mtres high and a metre wide & deep. Would 3030 still be strong enough? Should I go for 4040 or 4545? Also-does anyone know a good cheap supplier to UK as cheapest I found for 3030 is £10 per metre, so cabinet would cost over £180 just for the extrusion..then all the corners and panels, screws etc...