Thanks for all the suggestions guys. The original doors were 25mm ply skinned with aluminium and never warped - so I was following that method. The trick I hope is to get some good quality ply and then seal it against moisture ingress. My favourite so far is something called duraply which is an engineered ply made from Poplar.
I will be cutting out the centre though so as to allow for a small door pocket and lighten the whole thing. I have just completed building a camper van from scratch so have all the good tools for that kind of thing.
Cheers, Robin
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