just read your thread from the beginning, must say that i'm impressed with the work you've achieved! You've been self critical, had a couple of knocks but brushed them off and you seem to have made a real machine!
I've been converting an orion to Zetec power and have looked through and found some inspiration, need to look into oil coolers for sure.
It's clear you've done a stirling job, definately prefer it in a more stealthy road guise.
Good work dude!