All good advice!
FG Resin in this heat by yourself maybe 3 ounces at a time with pre cut mat from inside. No use adding mat on the outside bottom because your going to sand it off unless its a hook-recess-dip-wave?
Easier to blend and bond if you have cloth that's the same as the hull. Flap wheel a quarter size around the hole all the way to glass.
I've never tried getting sneaky about it and not gel coating the whole inside anyways. Needs poly, odds are the gel coat also needs but some do run roads and boulders more than others.
If you can get away with reusing the major flat portion holes for new poly, filling holes can be cut down to 60-70% less work.
It also involves jacking the hull and a good creeper to tape the bottom side before you put new poly on.
Multiple flips can be avoided with correct planning, and not much worse than a brand new poly/gel coat job that leaks, unless someone else runs into you on it's maiden voyage? That really SUCKS after all that work!