Well, depending on if I can actually get Ed at Trollforged to agree to cast some bits for me or not , it may be that the hands will be in metal. The end of the tail is in metal, and the claws are in metal. Want as little metal as possible in there really, for weight and cost issues, but some things, like the hands, are just proving to be very difficult to get 100% quality castings of as is, so I've cut the hands off and done metal versions of them which can then be spun up (with claws in place) and used to make either moulds for metal or for Ed's spincast plastic process. Which is what the other metal bits are going to be for - solid master castings that can't be broken by the moulding process and can be replaced if lost mid-flight over the atlantic if they end do end up going to the USA.
There a few bits that won't fit into the mould tin I'm buying (I'd need to buy a new mould press as mine doesn't open wide enough to accommodate mould tins for moulds thicker than 2.5 inches) such as the rock and the ends of the wings (going to try those, but have my doubts) but in theory one could produce a solid metal dragon given time and enough funds for the hideously expensive silicon moulds you initially need. The cost of it would be phenomenal in metal, though!