I've started to build myself a Levinson (40% ortholinear split keyboard) and I'm really enjoying the whole process. Except soldering burns maybe.
@lectronice For my Preonic I almost didn't change a thing; and it works great
Be advised, all keyboards are ISO QWERTY, it's your OS that maps that to AZERTY or whatever. So if you assign a key to "Q" in the hardware map, that'll type an "A" on French computers