If you decide to take this on I highly recommend you shop at US Composites. Fiberglass , Epoxy , Composites, Carbon Fiber - U.S. Composites, Inc.
I no longer use any resin other than their 635 THIN Epoxy
. Slow cure, no blush, soap & water
clean-up (before reaction starts), great wet-out. Way less costly than any other epoxy
I've found. Non-hazardous shipping
. I usually buy in the 3-gallon sets. Get their pumps to insure correct ratio.
I use 7 mill polyethylene film as the release layer. You might think about getting it all set and vacuum bagging.
You will also find other fillers, cloth (glass & carbon fiber etc) 3M microballoons, mold
release, silicone rubber. They have really good how-to videos.
Our bow was also crunched although nowhere nearly as severe. The inside was formed and then the outside was built up & faired.