MCU came in today so I managed to get Ion wired in enough to move and home the axies. Toolhead wiring still needs to be done since I need to run a can bus as well as waiting for the LEDs to come in to wire those up as well. It'll get printing soon enough.
In the mean time, the BigTreeTech SKR Pico is a tiny fucking board. Same size as a raspberry pi and running an rp2040. When comepare to multiple other boards, it really shows what it's made of.