I have a old Matias keyboard which is broken, and was thinking it might be a nice project if I could re-use the switches and caps from it to create a new ergonomic mechanical keyboard from a kit. As I understand it, that means I need something which supports ALPS compatible switches, but most kits seem to be designed for Cherry. I haven't built a keyboard before, and have only done a small amount soldering, so as a first dip of my toe in the keyboard-building water, I'd be wanting a project which is not too complex.
As for the type of keyboard: I'm interested in an ergonomic keyboards, preferably split, but if not, at least without a single long spacebar. ISO-like is preferred, but would also consider trying ortho or non-traditional designs. Ideally it would strike the balance between being minimal and portable, so around 60%-ish size wise would be the sweet spot.
Avoiding excessive shipping/customs charges would be a factor too (I'm based in the UK).
It's quite a long list of criteria, so maybe I'm being too optimistic here... but can you recommend a reasonably priced kit that would meet these criteria?