Okay, it's a numpad. However, if you happen to have access to a gantry-mounted diode laser engraver, it should be able to cut through cheap and readily available 3mm Masonite without much trouble (my 5w Comgrow took two passes). A couple of coats of textured spray paint gives a surprisingly nice finish, and mounting the MCU on top left me with a 12mm thickness for the main body, not counting the MCU and before feet, switches, and keycaps. This numpad came in at about 30mm "desk to finger" with no additional efforts to keep it low profile. I'm not doing anything new here, just confirming that it doesn't have to be insanely difficult or expensive to do a DIY ortho-split.
I don't have any RSI issues right now, nor am I particularly motivated to change how I type, but ergo mechs are one of my favorite parts of the hobby to follow, and I even made a pretty rough one once. As an aside, I gotta stop taking oversaturated iphone pictures in the office I share with a dander-factory of a cocaktiel. I look like 37% grosser than I really am.
This is precisely what I do with the keychron Q0. Love having a numpad, but I also love having more room on the right side for my mouse