He's done. I finished him up this morning for the Bell of Lost Souls Nid competition. I ended up cutting a piece of board the size of the Trygon base, and mounting a brass rod from the base into the gut of the Tervigon. Then I wrapped the central birthing canal around the brass rod. He is also the first model with my new lights for photos. Now my pics won't all be so dark. I am still undecided on whether I like the egg sacks on the back or not. The next one I build will probably be the same, with the egg sacks only underneath.
I am also going to do a step-by-step on painting my Trygon. I learned a lot about painting big bugs on this guy.