want to turn my closed bow (ps 190) into open bow

well i have been doing a little brainstorming and been thinking of a winter project. i have a ps 190 and was thinking of turning it into an open bow. i would not make it a walk through windshield so i can maintain the structural integrity of the hull(a friend i mine tells me centurion did this with one of their boats). what i had in mind was to cut out the top. make a sub floor 8-12 inches or so from the top of the hull. make a small box frame(to hold a fat sac) redoing everything in fiberglass. and lastly getting one cushion made that would cover the new floor. the new proposed area really wouldnt be for having people ride up there but more so to be able to have easy access to the fat sac and maybe a little more accessible storage areas on the sides. any logistical issues why i shouldnt undertake this other than 1) i have never worked with fiberglass 2)probably stand a good chance to ruin a perfectly good boat 3) did i mention i have never worked with fiberglass.