how deep are they? could just be flex cracks in the gel....though i have never seen them on the underside of the boat, they are commonly on the gunnels and bow.

how are they stringers? solid? rotted? how long are they stringers?

eh, im not sure....that doesnt look good.

At this point, i dont think that is an option. I have a lot of money "locked up" on this hull and i would rather just fix it if at all possible.

what make is boat ,did drop on trailer or get droped, is this a chip or hole

Bobby, Check your PMs!!!    

Does the name REX mean anything to you?

Hey this makes 3 of us in the area.  Maybe it's time we get together this summer! 

Well, you get your motor back together and get that crack fixed, if only for the beginning of the season and then go fix it.  I'll have everything mechanical and electrical back in like new condition and I'll run it that way for a couple of months and then I'll tear it all down to repair and repaint the hull, new carpet and upholstery.

IF the crack doesn't go clear through then you can get by with grinding it out about an inch or so to each side, making a slight trough then lay in some mat and epoxy and build it back up and sand it smooth.  You might get by like that until you decide what you want to do.

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 !!!!

my southwind had cracks on both sides just about in same spot - on upper side of each stringer - i reglassed both inside and out- not a fun job - but needed to be done cause i liked the boat -