Functionally, this is not meant to be a particularly weird board, well apart from the numpad being compressed and on the left. No single key is more than 1.75 times the width of a normal key, which means I did not need to use any stabilizing hardware under them.

As somebody else noted, the second “caps lock” is really enter, and then I just have the four upside down ones on the bottom row mapped as space bars. A more generous set of keycaps could have the exact ones you might need in size and shape and label for even a weird layout, but this cheap set from Amazon worked out mostly OK. Flipping the space bars also helps with the typing angle, when you don’t have proper space bars for the size you need.

Not OP but probably just the key next to the "’ key. The text on keycaps are just labels and do not dictate what the key does.

I’m not actually left-handed, but a lot of people like the southpaw style to keep the num pad around and integrated, but allow the mouse to stay close to the right side of the keyboard. I’m not sure what I think of the concept so far, but it came out pretty well, given the constraints I gave myself.

This changes the angle at which the meet your thumb. Many find this configuration more comfortable when they use mods instead of a spacebar kit. I do this too.