Good luck my friend! I just tried to pull the livewell out of my 18. It ended up having to come out in 8 pieces! Some of the potter putty is STILL attached, with nothing but some fiberglass matt attached to it. (the white blob on the center bottom of pic)
The floor itself broke free relatively easy, just a little back and forth on gunnels. Pretty much lets go right about when you think fiberglass will start to crackle.