Posted in reply to Ken's detailed answers and suggestions:

Ken,

your reply and answers to my many questions are invaluable. Many thanks for taking the time to go back 31 years in cadid detail!

Ithink Ican see a little clearer now on how to go about things on the reduced scale version.

I'll be sure to inform you of the results of my project when the time comes. Hopefully, I'll manage to get a build thread in.

Best regards, David.