I wouldn't trust a plan with so many simple and stupid errors. Personally, I would throw it away as soon as I saw the grated hatch covers on the deck. This plan was drawn by amateurs.see the plan I posted previously
round the hook at the bottom of the lower block.


there are definitely no hinges to the bottom part
In such cases, both halves were removed upwards along the guides. I know of at least two French ships with such covers, without hinges.