Re: how would you recommend repairing this hull
yup, you can spray our brush gellcoat on.. the tone's may not match perfectly, but its better then nothing. spraying will make it more even and smooth.
is there wood showing through on the chime area? if so then grind the gellcoat off around it(be generous give it atleast 5 inches all the way around the damage, assuming its still water tight, if its not give it about a foot all the way around and overlap afew layers of glass) cover it in a layer of glass, just a mat followed by a roven or cloth. or you can use a biax like 1708. and you wont need the mat. let er harden overnight, then you can sand it smooth and appy gellcoat to that aswell.
if there isnt any wood showing, then i would just clean it up abit and apply a coat of gellcoat.