Hmm, never done a semi-elliptical roof myself; I know David Jenkinson used to get long strips of timber moulding machined to shape, but he was building whole rakes of coaches at a time.
My normal method is is lots of plasticard profile formers, with a pre-curved length of 20thou plasticard secured to them. Not sure how practical this is in 7mm standard gauge, or for semi-elliptical.
How about this method for the flatter centre, and solid plastic strip filed to shape for the edges? Or solid balsa-wood sanded to shape and covered in thin card?
Not sure if any of this helps at all.....
PS Glad to see you are a Canon man!
I had thought of making the edges as a laminate and making a profiled scraper. Your centre idea sounds better than the way I was thinking. I could of picked a later one with an arc roof but then I would have to completly build the driving carriage.
Yes I am a canon man a lovely crimbo pressy from my wife.
Edited by N15class, 01 April 2012 - 22:15 .