I would not want to recycle that boat
Heat bonded composite (foam and sheet) would have to be de bonded and or seperated out, most extruders don't like foamed stuff being fed into them.
Not to mention the dirt ingress and uv / salt water damage done to the polymer structure and all the fittings that always get attached to boats for the rigging and all that.
Then internally there would be dirt and damage and chemical attack from oils and fuels needed on boats for cooking and fuel.
PET is a bitch to recycle, even virgin material has to be very dry to prevent degradation in the manufacturing process. most PET is recycled into fibres (with lots of colour) for clothes since its no use for bottles anymore.
Most plastics people take the view they either you recycle plastics into something like compost heap bins or other things that can be black (white or transparent recycled things... ha ha ha) or don't require special properties (street furnature) or just hidden like sewage pipe or access points. Old PVC windows can be reused as the bulk of new window frames but only the core, a outer skin of new white PVC must be used as people don't like grey window frames. (assuming of course thet the UV stabiliser used in the old frame was not toxic)
Final option, burn it, recover the energy. seen by many as better than wasting energy trying to recycle something into something else that is really low value.
Only 4 % of the oil produced worldwide is turned into plastic, the rest is burnt in some way or another, so use it as plastic products first, recycle it if its feasable, then burn it.