I fully agree with Stan that there's too much false information and hysteria regarding shrinkwrapping. It is the best way to keep moisture off your boat . . . IF proper ventilation and standoffs are used.
In addition to a reusable zippered access panel (3 years with the same panel now), I have had at least 6 of those clamshell vents installed in my shrinkwrap jobs - very effective. To assist in controlling excess moisture, I fill three shoebox size containers with a 50/50 mix of calcium chloride and cat litter and distribute them in the cabins below. Never had a mildew problem with this boat.
My frames are also held outside of the rails, by standoffs clamped to the stanchions - as shown in this pic: