Moxieabs":86upu7ag said:
I definitely have the poured in foam under the portapotty space but no plugs int he flats under the mattress. Just like to know what I might be facing before making the first cut.
If I had to bet, I'd say you're going to get lucky

My boat is just one year older (2002) and I, too, had the "foamed in" foam under the porta potti foot area. In case this gives you something to go on, my boat has a ~6" round, white plastic inspection plate right under where the Porta Potti sits. I couldn't even get the lid to turn! So I removed the screws holding the flange in place and pulled it up. Filled with spray in type foam, and the top of the foam was "engraved" with the exact details of the underside of the top. That had "stuck" the lid so I couldn't unscrew it. This foam basically supports the "well" of the potti area of the v-berth flat.
No plugs at all, so I was not expecting foamed-in foam (but still glad to find out for sure). Now that I have taken all the big blocks out, I can see how they put it together....
1) Start with a bare v-berth.
2) Lay down a grid of 2" masking tape, sticky side up.
3) Place pre-cut (and marked) blocks of styrofoam (massive blocks that totally filled the space) onto the tape, so they are held in place.
4) Lower v-berth molding in on top.
5) Tab v-berth to hull on top side of v-berth.
The blocks were way too large to have been put in after things were glassed in up there. I'll write it up soon with photos. Be interesting to see what you have!
Sunbeam