Thanks. I am overall very pleased with how it came out, especially on a budget. In particular, the layout is quite usable and versatile. Visually though, I've had to convince my brain that my hands are in the right spot. The left hand modifiers aren't actually too small or anything, but your hands are set up much closer to the left edge, even compared to a typical 1800 layout, so it's a mental adjustment.
I may or may not extend the keymapping out to include four spacebars and move some other bottom row stuff around, but that could just be that I got used to that layout on this one's immediate ancestor. I don't hit the wrong spot so much as forget that the spot I'm aiming for is now an Alt key.