I cut mine out last weekend on my 1984 55' convertible. The three best purchases I made to prepare for this was a thick yoga mat, a 4.5" diamond blade for a right angle grinder and a Tyvek full coverage suit. This was very intimidating for me, being in that confined space with a diamond blade spinning at 30,000 RPMs. I was shocked at how easy it was. The first thing I did was cut a large square section out of the side. That made it easy to reach inside to cut the other side so I did not have to crawl out and move to the other hatch. It only took about one hour to completely cut the tub out. Mine was not beaded into epoxy but was tabbed along the bottom edges. The glass is pretty thick there so cutting and cleaning that took most of the time. I just cut the top out as close to the hatch drain as possible and sanded that edge down. It took more time cleaning up the pumps, hoses and electrical wiring. It is a messy job! I wore the Tyvek bunny suit, a respirator and full goggles. It was totally worth it, the area is huge and much more usable with the tub out. I purchased 2 of the diamond blade but never even dulled the first one. I was prepared with a sawzall and a vibrasaw but the right angle grinder is the ticket. Be careful.
Guy