Stainless is fine!
I'm using 0.9mm brushed stainless, which looks very nice (although Minwah's panel is extremely cool, and I would have used that finish if it was available)
I just guillotined mine down 1mm today and folded it to fit my CP ends on the sheet metal folder. Couldn't have been easier (he says, having successfully done it)
Definitely glad I went this way instead of powdercoated mild steel.