Found the pics of when I did mine of a similar size - frame under marine ply, then weak sand/cement mix to support the tray.
Having a friend help out was invaluable.!
Sweet, just checking I'm not overbuilding the thing to the nth degree. I aim to do tasks like this so i'm not going to have to do it again, or redo due to leak/issue for a few decades.
@BrickMan started
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Found the pics of when I did mine of a similar size - frame under marine ply, then weak sand/cement mix to support the tray.
Having a friend help out was invaluable.!