How to compile a luci-app for Omnia OpenWRT version

I’m hijacking this old post since there was no reply.

I was considering attempting to make this myself. I was digging around on the respository which seems to be where the OpenWRT distribution for the Omnia resides. Is it correct that I need to start at Ondřej Surý / openwrt · GitLab?

I am aware of CoovaChili, but that’s just far too complicated for a simpler home environment.