ALMOST awesome. I'd like this but: 1) Keep it thin, however 2) cram all that extra space full of battery, damn the weight, and 3) make the case solid metal. Steel if you must. I want it to feel like a contiguous block of metal with no give (doesn't necessarily mean you have to make it impossible to open, but if that's what it takes, go for it), plus 4) some fast wired interface. Gigabit ethernet or (better) USB3. Oh,…
Making the case out of solid metal rather than plastic is what will bump the price up. Making custom plastic cases is really cheap. Doing basically anything custom of of metal is much more expensive, doing a single pieces of metal with a complex shape doubly so.