I'm going to put myself out there, on a topic that most people would never wish to say anything negative on, and say this:
I wish this whole "item on top of a normal keycap" phase would pass. It's nice that people are able to make some custom keycaps, but there is nothing desirable to me about a 7 foot tall keycap. You know what was nice about girlDC's caps? They didn't do that. He managed a way to fit the stem in the design of the cap, not fit the design on top of a normal cap.
Now, I'm not saying this is not a great idea, but I think, most especially with a design of a hat, that the cap can be better. Since the inside of a hat is hollow, the stem can stick out of it just fine to engage the switch. This would eliminate the unsightly "normal cap" design of it.
Am I the only one who thinks this?
Oh, and a Topre one is required. Or at the least, buckling spring. Nate like buckling springs.