https://nudo.com/p_polymetal.php Similar. 3mm thermoplastic with 0.17" skins and baked enamel finish.
Another product is Grimco Maxmetal.
connect.grimco.com/blog/maxmetal-meet-the-brand
They have Light, 6mm and heavy Duty variants, and single sided. I haven't seen their product, just the website.
You might form a single-sided sheet and then fiberglass the inner surface and fixtures where the finish doesn't count