I love the concept for this, but 0 degree angle I fear may be a mistake for actually using it. Could you consider possibly adding larger feet for the rear or possibly some kind of flip out feet if that was at all possible?
I don't think there's even enough room for flip out feet or even screw in feet for that matter. Thicc bumpons might be your only option.
FWIW I've got plenty of flat boards that feel fine with KAT or SA but those would completely defeat the purpose of it being so low profile.
UPAS, I like the little cutout for a wrist strap but it's going to interfere with how the board sits if you actually put a strap on there. Consider a relief on the bottom of that corner so the board sits flat with a strap or string attached.
Still working on a angling solution that doesn't compromise the aesthetic of the board!
Currently leaning towards 3d printed parts that prop up the keyboard from the back, but in a really neat way that makes sense and locks in to the board too.
That being said - that's a really good point about the wrist strap. And also, having a little less material there will make it easier to actually attach things there.
So I made a quick change to that corner:

Unfortunately, the 2nd proto is already on its way without this change, but I am not worried!