Looks beautiful @glyph. I love my ergodox moonlander which has a similar ortholinear split design with special thumb buttons. How do you access numbers and some symbols, do you end up with virtual "layers" you can access by hitting some keys?

I had a look around and a search like "corne keyboard prebuilt" turned up some results. This was the past I found so far:
https://mechboards.co.uk/collections/pre-builds