Once Sean had Braomar the way he wanted him to look, he & I discussed how I would install the electronics.  Obviously I needed the figure to be somewhat hollow so I could run the wires down from the fireball, but it also had to be strong enough to be durable in the real world.  Sean used Blender to edit the .stl files to create the interior hollow, and then gave me the files to print.  That actually went very smoothly and the first fully successful print (there were a few false-starts) was the one we used.

I've uploaded the .STL files in case anyone wants to take a look.