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Glen -

Congratulations on the work so far. It is looking good and now the fun part comes.

Answers:

1. I personally would just prime and paint the replacement floor. Any vinyl sheet good would help durability. A sign shop will have what you need.

2. It could have been some kind of dealer installed option but I doubt it.

3. Could be for a courtesy light or maybe a electrical receptacle. (charger for trolling motor battery?)