Trapdoors were quite straightforward to design after doors. Here are all trapdoors showcased here with their matching tree barks & doors counterparts.
You’ll notice I didn’t use full height on the POM (the POM effect is a tad shorter than the block depth). It’s a design decision, I thought full depth looked too overwhelming & the repeating pattern caused by POM was a bit off-putting. This level of POM is maybe not to scale, but feels much more natural.
HardTop Vanillaccurate 
There is no reflections on the iron door and trapdoor ? Or is it planned maybe ?
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It’s supposed to be, iron door & trapdoor are flagged as metallic, but I decided to have them a bit less smooth than the iron block. Check your shader if you don’t notice any reflection at all, maybe reflections aren’t triggered below a certain smoothness amount. In that case I can raise it a notch.
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