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Sorry for German link, but 1m, 10cm deep 5mm thick raw aluminium for 30€. You'd have to find someone that sells you the length you want though.
Drill some holes, bring to powdercoater, have fun.
https://www.aluscout.de/Aluminium-T-Profil-1000-x-600-x-50-mm-B-x-H-x-s-Oberflaeche-pressblank-roh-Verkaufseinheiten-in-Stangen-je-6-m
This kinda thing. No idea how annoying to incorporate, but seems nice for less grubby edges.
https://www.tilingsuppliesdirect.co.uk/product/schluter-shelf-w