It's extruded aluminum and I think you'll be hard pressed to find anything like that. Most people that DIY their own lighting/ballasts use a grey metal box that they find in the electrical section at Home Depot / Lowes / Menards. It isn't pretty but it works.
I used to be able to order extruded aluminum like that, but I have to buy 16 of them at any one time, and the shortest piece is 20 feet long. That will let me make a couple hundred ballast enclosures. 8O
Yes, I know it's hard to find and that you have to almost always buy a large quantity of it... just hoping that someone knew where I could buy a little. I like the way it looks and I'd really like to find some. If you know where I can get some... cool... otherwise there's no need to post. Thanks.
This looks like perhaps something a Storefront glass manufacturer may have. Or know where one could fine some. Look in the Yellow pages for some one local