This is the stuff I used it comes in different thickneses (web-address) so you prob could use it to build a superstructure, with very little extra suport. I use the glue (picture) its a P U Glue that foams so fills any smal caveties, but you have to clamp it (picture of deck drying) OR Weights, the glue is what was recomended and is ideal for our use as it is even sea water proof,but If you get it on your hands its there for 10 days so wear gloves, for a superstructure I would try epoxy for joints.you could use it to plate a hull or a deck , but as far as planking goes if it was to have a painted finnish it would be ok but it would not take a stain. the picture is of my fire boat deck drying it was bonded to lite-ply,and only takes 20 min before you can start hacking at it again. Peter
http://www.mickreevesmodels.co.uk/