Sorry for my delay in responding, so if you are referring to rebedding the stanchions, there are no backing plates and yes in some spots they are very hard to get to, I had to cut a few access holes in the liner to reach the bolts. I understand you are asking about hardware thru the deck but specifically which hardware? Oday did not bed with any type of sealant from the factory, so I when I put everything back together I bedded with buytle. All of the holes (including 62 for the sheet car tracks OMG) I over drilled, filled with epoxy and redrilled then used buytle to seal. Let me know which specific areas you are talking about, but generally no they were not good about using solid backing plates in some areas, other's there were some wood backing plates which I'm going around and making new ones for. .... and the fellow above is correct for most of it you do not have to cut into the liner. The cabin top handrails are thru bolted all the way, those were tough to fill with epoxy tho because even tho they were thru-bolted there is a void between the liner and the top layer of glass, we made it work tho. I even took off the mast collar and it was easy to rebed. One of the only things I have not done yet is to remove the traveler, so not sure about that. The lower shrouds do go thru to a plate in the deck.
Shorter and more to the point, most all of it is thru-bolted and not screwed into plates in the deck ;-) and I don't remember any nuts being glassed in place.
I hope this helps!