Looks like the Speedo board already exists 
GitHub - cozykeys/speedo: A 66-key ergonomic mechanical keyboard
Designed by @wangledorf: Ergo87 Progress Thread - #4 by wangledorf
Think I’ll just rename it Pteron for now.
Still haven’t had the time to do the soldering on the prototypes I received a while ago, but perhaps til weekend. I’m currently on holiday, so it would be nice to have a completed board to use on work on monday!