@TimO What a fantastic build, thank you so much!
My build:
OH2 -> 3.0.0 upgraded via raspberry pi update (in OH3 instructions)
Battery Nodes, Color Lights, Buttons, Moisture sensors
My Sensors Eth Gateway Serial bridge

Side note for any newbies like me out there. Follow the instructions for OH2 installation for my sensors. Follow the directions for manually adding in the addon. And using TimO's jar instead.

I've been monitoring all my logs and no issues reported, everything seems to work just like in OH2.