UNJO made a Homemade bass boat! Complete video of how it was done from structure to carpeting. We transformed a 12foot vhull until a sick little bass boat! Follow us on Instagram: @ultimatenjoutdoorsmen
The next time use a hand grinder, with a metal cut off blade. As long as the plastic isn't cold. You'll have no issues except dust. It's how I cut my siding pieces for 30+ years, even in the dead of winter. Another hint, cut your plywood about 3/8th an inch shorter then the width of the intended spot. Once you have the carpet on it'll hide the gab and you won't need to force anything into position. Just remember that'll change your measurements for your cutouts of your storage. So adjust accordingly.
Obvious comment but building light is critical to getting the boat on plane. Minimum hp on your boat is 15hp two stroke. The two stroke is about 75-85# and more punch than a 4 stroke. Nothing worse than a boat that won’t get on plane. Takes forever to get anywhere and back again.