It does seem that it would be just as easy to screw it together from the backside as from the top (thus hiding the screws). Or, countersinking the screw holes would look better. In any case, getting rid of the pan head screws would seem to be a plus.
I like that the case isn't anodized. It would be easy/inexpensive to get it coated locally and makes for a nice customization option for people.
My guess is that if you want to start selling kits, you could get cases, plates, and PCBs, foam, etc, put it on a website, people will buy it. I'd lean towards adding any and all options, QMK, VIA, USB, RGB, ABC, etc. - this looks like a board that people would want to use every day, not just add to their collection.
I agree with the previous comment that the Boston graphic likely doesn't add to many people's interest in this board as few people have any connection to Boston - 0.2% of Americans live there. It wouldn't stop me from buying it though. I would prefer a barebones kit, even to do my own anodizing seems like a fun customization option. Most cities have places that will anodize for people who don't want to DIY. You could also offer anodizing for a fee and probably make a very good margin on it (DIY anodizing isn't for everyone, most people don't have buckets of acid laying around, and you can get it done in batches much more economically, and make money on it...
Anyway, I want in the GB... I PM'd... will PM my contact info since I don't login here very often.