For some reason, making the box out of 1.016mm steel instead of 1.22mm would save me a lot of money. However, this meant I had to change every single coordinate on the box to account for a different outer radius of the bends... This is now finished, next up will be the PCB holes, I/O holes etc.
I've also checked the price of powder coating the box, it's about 200 USD (!). Have to think seriously about that one.