A few floor questions...

[bcraigan]

I'm looking at replacing the floor in my v20 and I want to ask a few questions before I even cut.

1) How close to the sides should I cut?
2) I have found through a few of the access hatches that in places the floor didn't meet the stringers. IS that normal, or should i remedy this in this floor replacement.
3) Do I need marine grade plywood? If so where do I locate it at in the Columbia, SC area.
4) Is West system resin the best or would you guys suggest something else?

Thanks for all the info.