My friend you are on your way for sure, and I agree with the guys you good with a saw! Now be as good with the resin!
Remember you must build the inside skin first , use a angle grinder and grind all mating edges at an angle also grind off all gel coat or paint as much as six inches if you can exposing the fresh resin or mat you then use new mat and resin and build it out in layers at lease two if you can on the inside (area where you will pour ) wet out the inside skin using a small roller covering the entire area then insert huge pieces of mat covering and overlapping the seam or cut in this case. Basically you are adding strength to the skin. I remove my outer skin see my posts. It must me noted base on the some of the warnings on this site I figured I will yes over strengthening both skins and I did.
I use close to four gallons of resin and six to nine yards of mat in mine I can assured you that skin was four times stronger when I was done with it.
At the same time i lowered the drain hole on mine.
See the photo below my skin was as thin as paper with holes after cleaning
Skin back on
Ready for Gel Coat
