Thanks again for the comments, glad people like the 'lil case!
So on the subject of having them manufactured, here's what I've found:
Copper isn't realistic for a few reasons - first, it's pretty expensive just for the raw materials, and second, protecting it is difficult, the only real option being spraying with with some type of clear coat. Unfinished, if I touch mine with bare hands, it begins tarnishing in under an hour. And it's surprisingly heavy. Looks great, but just not practical.
Aluminum has several advantages - light, relatively cheap, it can be anodized or just polished and left bare and the finish won't degrade unless it's subject to a fair amount weathering.
So, I've looked into having it manufactured in aluminum. My mill is great for prototypes and small quantities, but not realistic for any significant numbers. I could probably cut 1 to 2 per day with a lot of manual intervention - tool changes, flipping over the material, zero'ing, etc.
So I got a quote from a real manufacturer and here's numbers - in a quantity of 1,000 cases, they can cut them for about $16 to $17 each. Add in some screws and packaging, and it'd probably be around $20. But, they don't do the polishing and the brushing on the top/bottom, so I'd have to do that myself, manually. I've e-mailed the Raspberry Pi Foundation regarding possible licensing authorization for the logo, but haven't heard back yet, so that might have to go or be replaced with something else. Throw in a few dollars here and there for payment processing and kickstarter fees and it's probably not even break even until $25 and that wouldn't count for polishing them each by hand.
That said, I'd love to hear people's feedback on what they think a reasonable price would be. Obviously there'd be more value in this than the actual utility of a case for a $5 computer, the question is how much? Unfortunately, this is just a very costly method to making something like this. Injected molded plastic would probably be pennies to maybe a dollar or two... but just wouldn't be as cool as machined aluminum.
So, let me know what you think.