In terms of layup, all depend what you want: light, super strong, something between.
A classic good construction would be:
for the deck from the EPS core to the outside:
-60 to 80gsm glass this layer doesn’t really give strength, it help spreading an even coat of epoxy between the EPS and the PVC foam. I also had good results without fiberglass spraying PU glue directly on the EPS then applying the PVC foam under vacuum but it is messy and you need to be really fast closing the bag.
-3 to 5mm High density PVC 60 to 100kg/m3
-2x layer of 200gsm glass overlaping rail
-3 patch of 200gsm carbon over the mast plate zone
For the hull you do the same
If you want to go light you replace the 2x 200gsm glass by 1x200gsm carbon 3K with one layer of 60gsm glass (optional but help with finish)
This construction require a vacuum pump
You can use the high density PVC foam only on the deck and do single skin construction for the hull but it won’t be as strong. In this case use 4x 200gsm glass if you have a good vacuum pump you can use 2x 400gsm bax + 1x 200 gsm glass woven but biax is harder to get around the rail and nose.
