Thanks for the hard work @krachlatte!
Never complied a kernel from scratch before and never owned a SBC other than Raspberry Pi's so this is going to be a very steep learning curve; but going to give it a go!
I loaded the provided Orange Pi 3 image ( Debian with GUI). Boots fine, and Ethernet works as expected. I've then copied / converted the .dts file from that image ( Included below). Could these be used to provide a Armbian image with working Ethernet since its based on a working OrangePi Device Tree?
I can't attached files; so I've inserted the contents of OrangePiH3.dts...
Also can't use Spoiler for some reason?? apologies.