I took a quick peek. Interesting stuff. Is it all stainless? It's probably not easy to cut and shape, is it?
The thin stainless might not be too bad to cut, although the lighter gauges do emboss deeper, complicating things.
They also do aluminum (brushed, polished, ...), plain steel (in case you wanted to machine a part and then plate it yourself), copper and brass, and a few others. I can't find the list on the site, except on a drop-down on the samples request ("contact us") page.
I rough-quoted them as a possible material supplier for machine skin panels. They do all different gauges of thickness, too. If you call them, they'll send you some samples. Mine were about 6x6". You should be able to ask for samples of specific patterns/scales/metals/gauges, if they have some on the shelf at the time, IIRC.
There are some good shots in their brochure, off that same page.
My company ended up using painted panels instead, but we did buy the diamond/lattice stuff (WL pattern) welded into tubes, for use as door handles.
I always thought that a retro-ish bass would look cool with PG or pup surrounds out of the parallel stripe pattern with black powdercoat infill.
The aluminum looks a lot cheaper than the stainless.