The PCB's have arrived so I guess I'm committed now. A few queries to pose in the forum and I can get an order off for the parts so I think I'm at the entrance to that hole now. Should be fun and if it turns out ok I'll post pictures
You'll find it a most rewarding build and Richard is very helpful here on the Sapphire thread.
I ordered most of my parts from Mouser and they added up to enough for free shipping to NZ...a considerable saving.