Not to be beaten (call me obsessed if you must) I have realised that the plastic platform surface would not allow me to place the station building, so kindly built for me by David John, nicely on a flat surface. Most of the platform could be lived with but no method I could see would allow it to be kept flat enough for the station building to sit level.
Platform episode 93 follows.
Thinking about a water proof temperature stable material that could be found in around 3 mm thickness I wondered about synthetic slate tiles!

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This is smooth and flat, 600mm x 300mm x 4mm. I consulted a builder friend who said they were readily available and not too expensive. The material, being used for roofs is obviously waterproof, should be temperature stable and can be scored and snapped to cut it.
I tried the cutting method and found I could not do it. Then moved to a hacksaw which would cut it, quite slowly and the length is a problem. I have a hacksaw blade in a handle, which I thought I could try, with loads of patience. I marked a line down the length of tile to cut away the edge with the hole and started hacksawing, did about 60mm, thinking there must be an easier way! I have an old hard point saw that does not get used for cutting wood any more, would that cut it? It does!!!! Easily.

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Have got this far
Phil