Simon, simple answer will be to cut some pieces and leave them outside! im not sure what constitutes outdoor material in terms of lifespan, Phill might have some ideas?
I'd not worry too much about long term lifespan, in terms of UV banjaxing plastikard for example, whatever it was would have to be finished and protected by paint anyway. I was thinking more about the effects of damp which MDF would be pretty susceptible to.
I'd happily trial something and pay for the materials used if that's any good, my goods yard will easily accommodate a hut or three and I'm not going to be fussy over style
Now that the garden's bare and after dead heading all the plants, I can really see my trackbed very clearly from the kitchen window, it would look so much better with a railway and its accoutrements placed on it......
Simon
not good for burning.
I may well do a platform tonight, then there will be some choices to be made, but that another thread isnt it? 
what sort of buildings are you thinking of wooden or brick built?
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. Would i need to contact this chap or are you going to for the letters/numbers etc. Could you PM me with details etc.
