Cart arrived today and now I've managed to get home and load it up with ROMs, I can confirm everything works as expected. Brief fun and games getting MacOS to mount the SD card read-write, but once solved and tested on my Lynx 1, all working straight out of the box. Massive kudos to SainT
For anyone still on the list waiting to get theirs, I can only reassure you that you will get there soon and it's totally worth the wait.
Now to get busy learning Lynx homebrew coding