Dave - Thanks for the link.
I should have remembered about "ACE" as they are referred to a lot on the "Rods 'n' Sods" forum.
Note:
Kapri from that forum worked with Gary on the original Sammio Spyder to ensure it was DVLA friendly.
I'm going to copy one of your points above onto my own build thread, rather than pick up on it here.
Cheers, Paul.