Brother Starwind Sailor!
It's nice to find you on this forum. What fittings are you trying to reach? I haven't touched my stanchions or the genoa tracks for that same reason.
I agree, the hull liner and the coach roof liner both make it difficult to reach the backing plates for the stanchions. I haven't made any cuts yet to access those areas. My thought is to eventually cut off that dropped part of the roof liner and possibly cut out enough of the hull liner at the top to make it easier. Then I would fashion some sort of cabinet moulding to conceal the corner along the entire length of the salon and the v-berth. I also haven't figured out how to gain access to the water tank deck fill through the vanity without destroying the vanity, which may be the eventual option.
Take pictures of your modifications!
Other fittings have been more straightforward, but crawling into tight spaces is the biggest problem.