Welcome aboard. I am not a stranger to fiberglass but have no clue how a 21 is built. Seems like Ferman or someone had one apart for the sake of redoing it. Hang in there. It has been a little slow on here. Destroyer notwithstanding, I don't remember anyone else going into one. Destroyer's work was excellent I might add.
As far as the transom goes--Is it simply plywood with a scrim that allows it to conform to the fiberglass? My concern ripping the outer skin is that the outer skin is typically much thicker on the layup schedule. In other words, if you cut the outside away, will the inside be sound enough, thick enough to allow you to replace the core and have it follow the curve/bubble. If it is a sheet of plywood that is used when clamped/glassed into place it would need something fairly stout or I fear you will loose the original shape. Not ideal to go into one. Ever think about pulling the cap and going at it from the inside? More work? Yes.. But then you will know 100%. Expose it all.. Not a quick or easy route. But it is expensive too.
Take a picture or three, that might stir em up.
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1996 -19' NV Flats 115 Mercury 4-stroke
1983 -20' Wellcraft Center Console 250 XS
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