For refinishing, we have removed all of the teak trims around the tops of bulkheads. Every length of trim covers the stapled edge of the vinyl, and tabbing of the wood to the deck or overhead. They even routed off a band of surface veneer so that the tabbing would not be too proud of the visible surface beyond the trim.If you removed the fiberglass headliner what would you do with the top of the bulkheads? What do they do with the tops of the bulkheads in 35-2s with vinyl headliners?
I have seen a *lot* of the underside of our decks in the last month as I have accessed different parts of the deck to epoxy-pot the holes for eventual reinstall of hardware. The layer of glass is indeed thin. considering that, unlike the top, it does not have to resist impacts and point loads. It's there to provide the bottom side of the "I-beam" coring, structurally speaking. After well over 100 holes, I find myself humming the Beatles tune about "how many holes it takes to fill the Albert Hall..."from doing my side decks, I can tell you that the thickness of the underside of the glass in the cored areas is quite shockingly thing. It is a single layer of 1708 or single layer of mat then single layer of cloth. It comes up attached to pieces of core and you are left with holes to fix before laying in new core.
No idea about the thickness in the uncored areas.