looks like you've got the idea. what you need is LOTS of glass fibers running ACROSS the break and then solidly bonding to good glass over a wide area. try not to cut the cloth for the patches so that only 1 weave will cross the break. turn the cloth diagonally and cut it so both weaves cross the break. bi-axial. again, the 1st patch could cover the entire crack by 2inches and be bonded to nicely roughed up glass. the 2nd patch goes over the 1st patch while it is still wet and overlaps it by another 2" and is bonded onto a new area of lightly ground off glass. 3rd patch etc.

if it looks like getting 3 good patches down inside the hull is going to be next to impossible you could beef up the repair by adding a 4th layer to the outside.

for the strongest repair you'll want to use the heaviest cloth that will make the bends. this may mean laying some plastic film over each layer and taping it down until it has hardened enough to keep it's shape. then peeling off the plastic while the resin is still tacky and laying the next layer on top etc.