I finally fixed the cracks in my DSII caused by the ice expansion in between hull and cockpit liner.
What I did was started to work on the cracks in the cockpit transom well.
Using a dremel I ground a v-channel along all major thru-floor cracks and some minor gel-coat crazing while I was at it. After cleaning area well with Acetone, I began by mixing up a very thick batch of epoxy using some West Systems silica filler to get to stiff peanut butter consistency. This was to fill the major gaps I had ground out without simply running thru into the hull gap. After it hardened for a few hours I mixed my next batch of epoxy...much thinner this time and then I laid down a couple of strips of fiberglass cloth(1.5" then 2.5") on the cracks. Smoothed down with a paint brush and all air bubbles etc removed it was left to cure over night. Next day I sanded smoothly and cleaned with Acetone. Actually besides being not really glass-smooth, the hardened fiberglass was not really pretty as it sets up a yellow-brownish color. Therefore it was easy to decide to put one more of epoxy down with a white coloring agent added. It did the trick and looks pretty good until I repaint the boat.
For the larger crack in the bottom of the boat, I pretty much followed the same procedure. Here is what it looked like before I started:
First step again was to grind out a deep V into the entire length of the crack and rough sand a couple inches along the crack to receive epoxy.
I did had to use a 2x4(covered with waxed paper) to push one side of the crack back up level as it had dropped slightly. I did this with my first batch of thick Epoxy 'peanut butter'. As I was working upside down under the boat(and the ground out crack was almost wide enough in one spot to push my baby finger through it, I had a challenge with gravity. Using a strip of waxed paper with duct tape upside down overlapping the paper on each side of the length of it, I laid down a line of thickened epoxy onto the waxed paper. Then I lined it up,smoothed it out, and the tape held it in place to cure. Finished up again with alternating sanding, several layers of fiberglass matting, etc as I did in transom well.
Overall it turned out very well and should be good to go and ready for paint. My next chore. I have a couple of questions and will start a new thread on that one. Thanks to those that offered suggestions on this project both in the forum and privately.