There are many advantages in making the pterosaur out of foam. One of them is the weight. Guidraco’s full skeleton including the skull weighs little more than one kilo. The skull is the heaviest part because of the teeth and also because of the details where I use modeling paste. A light model reduces shipping costs and exhibition costs. I can safely hang a 1,5kg skeleton using thin fishing line and paper clips. I also decided not to coat the skeleton with resin. Not only would that at least double the weight (it would at least triple the weight of the body), but it would also require different (and certainly heavier) connections for the bones. I currently use pins and silicone rubber (clear caulk) for that, which I can remove after the exhibit.
To keep everything as light as possible, I try to make the bones hollow and use as little modeling clay as possible. I basically use it to fill small cracks. Larger areas are closed with pieces of foam. When it is difficult to model with foam, very thin layers of modeling clay can be applied using cotton gauze as a base. This is shown below.