Bobbyblank
This might not be what you want to hear

, but about the cracks. That does not look good. I went back and looked at the other pics of your boat from the motor removal, and I have some questions for you. How far forward from the transom are the cracks ? Are thay around the front of the stringer ? If so you might have a bigger problem than you think, because thats where mine cracked

. Heres a link to my fix,
http://www.socaljetboats.com/index.php?topic=1284.0 . What I think happened to mine is this. First the floor starts to leak letting water between the floor and the bottom of the hull . The foam under there absorbes the water and holds it there rotting the wood in the floor from the inside out. Also once wet the foam becomes soft (like a sponge), allowing the bottom of the hull to flex (causing stress cracks around the front of the stringers) . In the pics of mine you only see one crack but after I sanded off the paint and old repairs

it looked just like yours, lots of small spider web cracks (stress cracks). This can happen on the trailer !! Thats why I went back and looked at your other pics. It looks like your trailer only has two bunks (the 2x4/2x6s) and I cant tell from the pics what size thay are. But if you look you will notice that the rear supports for the bunks are under the transome and the center supports are way in front of the stringers, so, once the bottom of the boat is not well supported inside it can flex on the trailer every time you hit a bump in the road. Causing these stress cracks near the front of the stringers .
I hope this isnt where your cracks are because its NOT a fun fix !!!!