I have been asked by Jim Penaluna, who is the secretary of the Perranporth and District Model Engineering Society,to offer his email and phone number. This could help in your quest to find help with your project.
phone 01637 830 490
some dates that might be of use
The club will run its portable track 5″ guage at the following:-
Bodmin & Wenford Railway, Bodmin General Station:-
April 22 to 25, May 29 to 30, June 19 to 19, August 5 to 7 and August 28 to 29.
Trevithick Day Camborne April 30
Wheels at the Royal Cornwall Show Ground Wadebridge July 17
members of the club will be at these events if you would like to ask questions
hope this is of help and good luck with your project
trevor