You could bring that back to life. It'll never look too flash, but it's probably saveable.
Just get a big pot of resin, dig out the soft parts, fill them up with resin, if they're not too big. If there's pressure dings with cracks in them, just sand the area down a bit, and put some resin over it to seal it.
The nose looks a bit knackered, could probably do with a rebuild. Just cut out all of the smashed glass, and waterlogged foam. Get a new chunk of foam and scarf it into the hole, sand it to shape, and glue it in place with a bit of resin, then glass over the top.
Seal up all the little holes and cracks with resin, digging out any splintered or broken glass first.
As long as the thing is watertight it will be fine to use.