jasonB
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I find an unlevel tray make it very hard to fit a screen with side panel, not too much of a problem if its just a door. Don't assume that if your ply base is level that the top of the tray will be!
I use thin plastic shims under the 4 corners to get the tray top level then fix them in place so they dont move, then apply the grip fill and place the tray pushing it down until it touches the shims, these stop it sinking under its own weight, once the gripfill is solid the tray is supported over its whole area.
Should say that your ply needs to be WBP minimum, marine would be better, you can get marine ply that does not meet Lloyds standards thats about 1/2 the price, thats what I use 25mm thick.
Another tip is to cover the front of the plinth with UPVC facia which matches the tray and can be fixed with silicon of a couple of plastic capped screws for easy access if required.
Jason
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