Got the model directly from the creator‘s github at https://github.com/Bastardkb/Skeletyl Had a friend print it for me. It was quite laborious to get all the support material out, I think my friend ignored the recommended print settings 😂 Other than that, it was pretty easy. Do you have any specific question?

Yep, the scrollwheel works exactly like a rotary encoder and can be used like one in qmk (see linked config).

I first tried the setup by wiring the wheel to the original mouse pcb and after confirming that I like the setup I set it up in QMK, which was very easy, but I had to unsolder two resistors for the leds on the pro micro to get two additional pins that I had to secure with hot glue. The Frood has more pins, so after moving to them it is easier.

Bit of a too open question. I’d recommend sticking with this board for a couple of months (looks portable enough to take to the office) and see if you maybe wanna try less keys or maybe sculpted (dactyl-style), different stagger, tenting, etc, for your next build. Also, you probably have hotswap on this one, so you could experiment with switches for that next build already.