Bathroom Floor Replacement

[DNMakinson]

Purchased a low milage 2017 Greyhawk MV29. Unfortunately, we missed the soft floor in the bathroom.

Slides and plumbing look Okay, so I think the root cause was likely a toilet over-flow. Everything is presently dry, and the major damage is above the rear wheel liner.

I have a plan of the Aluminum floor frame from Jayco.
I have removed the toilet, vanity, and am in process of removing all (3) bathroom walls.

1) Where to get the typical RV construction screws (long, washer head, Robertson drive wood screws).
2) How to make sure the wheel liner is properly sealed to the Al frame (if that is an issue).
3) How is the floor sheeting attached to the Al frame? I see no fasteners yet.
4) Best Adhesive to re-attach vinyl to new and old sheeting? Seems like a sticky spray was used originally, rather than typical mastic.

Kind Regards,
DNM

[RogerR]

Helped my brother repair a soft section near the door of his old Airstream. We took up all the vinyl floor in the front. Then cut out the bad and enough good wood to get near the metal floor joists. We then used exterior grade decking 5/4ths to bridge the gap between old floor and new flooring. Used simple exterior grade deck screws. When we finished that we installed vinyl snap together plank flooring back to the bedroom door.