I think a kit would be cool. GH60 gets my vote along with ErgoDox & phantoms.
If a 40% board finalizes amidst all the other projects flying fast and furious I'm sure a few people would buy them ... I'd kinda like it for my netbook actually as it could probably fit in the carrying case (a real keyboard for your laptop, what a concept).
So, one way to manage Pixel's idea of a levels-of-difficulty kit could be a "also suggested" link on certain pages ... so if you're looking at the bare PCB, there's a page showing where to get the PCB with diodes, which page has your cases that will hold that PCB, and links to find switches.
Right now, it seems the only way to find the PCB page is by searching for "phantom PCB" so I'm not sure if your page is laid out they way you want and you're trying to discourage bare-PCB buyers (which I hope to buy one early next year but we'll see)
Actually while I'm moaning about your page ... the "warehouse finds" list is, bar one, out of stock. Is the irony intentional or do you just not update your "catalog" too often?