FRP Top Removal

I have an 85 BJ73 MWB FRP top Landcruiser and have tryed to remove the FRP top to take advantage of the sunshine, but after removing all nuts and bolts holding the top on it still won't budge. It seems to be stuck around the rear side windows (the sliding ones) but there are no more bits to remove. How heavey is the top? Please help any advice would be handy.

[Climpus]

The last few bolts are underneath the rear side windows and you access them by popping out the trim either side of the rear seats and reaching up inside. It takes two people to then haul the FRP top off the back.