@hecatae Any update on the build? 
Also if there's documentation somewhere on how to go about making the build to accommodate the hardware changes I would be happy to take a stab myself.
If you look at:
https://git.openwrt.org/?p=openwrt/openwrt.git;a=commit;h=2cb24b3f3cd89692f3c0bd137f3f560ada359bfa
A rbr50v2 dts is required, plus the other files need adapting.
rbx50 covers the rbr50 and rbs50, so rbx50v2 needs creating.