Hi David,
I'll chime in if you don't mind with what I experienced with my '86 Legend 40. As you have seen already, I have lots of pics on my thread of what's under the cabinetry. Unfortunately, years ago rotted floorboards are what prompted me to refit the original interior so what you can see of my teardown is not the original Hunter cabinets. So, first things first:
Can you specify where the delam and rotted floorboards are? Or is it more an "everywhere" issue? On the good news side of things, the only bulkhead that you'll have to deal with is the center companionway area like on my thread. A jack can relieve the pressure from the bulkhead to allow you to remove the old and slip the new in place, though I went for a more thought out approach. That covers the good news, I hate to say
Working aft to forward, the smaller corner pieces in the aft cabin behind the center bulkhead also continue under the aft bunk. They are all screwed down to the grid (this applies to every floorboard on the boat, unfortunately) so the only way really to access the floorboards is to remove the section of the aft bunk sitting on them (as well as dealing with the bulkhead).
Next is the flooring in the galley area. The engine compartment side sits on the flooring, as does the galley side. No way to slip a new piece underneath. Also something to consider - if the current floor is in really bad shape it will probably come out in chunks (or like my original floor, handfuls of OSB mush). So you will need unhindered access to make patterns.
Following forward around the galley "L", same. Most of this sits on flooring, and it is not easy to remove. You have pretty good access under the sink to check this area, but unfortunately since it is in close proximity to the sink, fridge box and water heater, chances are high that water has been doing its "magic" there for a while. Following forward to the settee, the side panels are a little easier to remove, and yes, they sit on the flooring
Opposite side, if yours is configured like mine was, immediately forward of the aft head is the chart table area. Easier to get to the flooring but the forward edge will be covered by the aft corner of the settee. The port side settee will have to come out to access the flooring edges.
Forward in the vee berth, the only conflict will be with the vertical panel/side wall of the head. Not too terribly difficult to remove, but access is hard in the corner of the head due to the cabinetry inside the head.
Points to think of: most of the cabinetry was installed as pre-assembled units. They are not designed to be taken apart from the outside in. If you can detach the units as a whole they will suffer much less damage. Another biggie: My original floorboards were 5/8th OSB. Measure your flooring - Hunter might have changed it to 3/4" but that extra 1/8th will mean nothing will fit going back together if you can't find 5/8th marine ply. Ask me how I know!!
I might have some old pics of the original interior refit showing some of this - let me know and I'll see if I can dig them up.
If it's any consolation, my original repair/refit happened while I was a liveaboard (though not married!). It gave me lots of incentive to finish the project! I originally repaired one section at a time. It's not easy, but doable.
Cheers,
Mark