Re: Hatch restore?
I'm working on a similar project for my anchor hatch (much smaller though... about 12" x 6" triangular). Wood was rotted within so I dug all the wood out, sanded/grinded the inside of the hatch to fresh glass. I had some marine grade ply leftovers so cut to size and covered in a couple layers of CSM and resin. As soon as the weather warms up, I'll be mixing up a batch of PB to glue it in and use the PB to fill in all the gaps between the hatch cap and new wood. From the sounds of your situation, you can prob do similar.... But I'm sure others will chime in with much more experience with this.