Thanks for the link Marty, I was talking with Chris from HEP - and he pointed me to the same Marco rails. He said he uses them on his FH's, so they may just need slight adjustment...
I might take up Beakys offer, and see what Dad can come up with, if they arent quite right i'll grab them from BOP.de and hope mine dont dinged up on the way here.
By the way, brilliant write-up on your Funhouse project, and great games line-up too!
Thanks for all the help guys.
el_timbo