Maybe consider splitting backspace too depending on how you feel. since it's dvorak compatible and I don't use right shift anyway (for design #2,3) I fully approve.
Dvorak people get no ~40% love
unfortunately 1.75u isn't really a standard size so you can do 1.5u in lieu of that (it's not a big deal depend on on your style) or you canget that size in one-off from SP or other or with a 1800 kit.
I like it though! If you get plates or PCBs printed, I'd get one and live the dvorak 45% dream.