Platform edges are an absolute bitch. OK if you have a nice straight Superquick attitude , but with the usual curly variety - nightmare. The edge on Edge is no exception with the rail forming a gentle reverse curve. Add to that the lack of big bits of card in stock and needing a smooth top surface, I ended up using an A4 sheet of advertising board out of Mrs F's special clothes shop which is made from a plastic substance which is like plasticard , but not. I seem to remember one of the Scandinavians that Nigel speaks to raving about the material at Eurotrack last year. After much swearing I got it roughly right with the use of three bits and some left over. It's only about 80 thou so even with a low-ish narrow gauge platform, needs jacking up a little and facing with brick or stone.
It's at this point in a build that I start to lose heart as it just looks like a pile of shite.... press on.