I feel like I'm a little late to this party, but I'll have you know that I registered a geekhack account specifically because of this! Thanks to /u/motorpsychoo on reddit for plugging the Heavy-6 and starting me down this rabbit hole.
I'm new to the Topre/FC660C club, but I've been trying to really make this board special and different with a few mods and this case seems like the perfect addition to really make a stand-out piece both to display and use.
Based on the thread above, here's my two cents:
1. Having the option of risers seems important. 6 degrees is a good incline. I find that 10 degree incline of the FC660C with its feet deployed is a bit too large and trips me up sometimes, yet 3 degrees withe the feet folded in is far too flat.
2. $500-600USD is way too rich for my blood (also I'm Canadian so add 30% to that to get CDN...) so no chance I'm in for the stainless body. That being said, it sounds pretty gorgeous and just absurdly beefy so I think the aesthetic of it is a great match. I'd love to see this done, even if I can't afford to actually have it sitting on my desk.
3. Motorsport yellow! I have a set of matt3o's MT3 /dev/tty caps on order and I'm pretty sure motorsport will be a fantastic color match between the grey and red, (ens especially with the yellow keys that come with the novelties pack). It would also match the triumph sets remarkably well.
4. Case height/weight isn't a big issue for me but it seems like lots of people want portability thought about. That being said, the aesthetic you're going for is clearly industrial and heavy so go with your gut and make the case that fits your aesthetic best. You clearly have good taste, norbauer.
5. Personally I think a maker's mark is great. If it's possible to make it optional for people without it making the whole run cost-prohibitive that would be ideal, but you also have the right to make that statement. People who think this makes your products seem corporate forget that graphic/signature "branding" is just a modern corporate behaviour lifted from the world of artisinal crafting that largely came before it. Go with what feels right to you.
6. Hasu compatibility is awesome. I don't have one yet but its on my list of mods I definitely want.
Even at the lower price range of $200-300USD, this is a lot for me (especially since I've probably already paid $500 into this board so far...), but I'm really psyched for this case and I'll be strongly considering joining the GB when it opens.
Keep up the fantastic work, norbauer!