Sounds like you had a night of extremely high humidity, my mount gets wet on those sort of nights here during winter.
I would not cover the gaps you have in the floor, just put in a false floor, I used 12mm C/D ply, butt joined across the middle, suitably undercoated and primed and put some outdoor carpet over the top, never had any water problems at all. Should the ply eventually rot, nice and cheap and easy to replace.
The lower hinge points look damaged for some reason, perhaps a strip of stick-on sealant under the hinge and wide flat washers may solve the water entry problem.
Cheers
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