While a sawsall will work, a much easier way to cut it up is to use a circular saw with a masonry blade...I doubt if you will use more than one blade. Masonry blades wear down as you cut but are very cheap and they don't dull but keep cutting surface fresh throughout there life, that is until the diameter is too small to be useful. Most standard sawsall blades will dull out in a couple feet.

A masonry blade in a circular saw will go thru the boat hull like butter...I have cut up power boat hull like this with a thickness of over 3/4" solid glass.

Regards,
Bob