I built a light box to mount behind the 10 Chest Buttons. I started with an Aluminum "project box" cover and bent the sides so that they were a little more than the original 90 deg. I cut 1/4 inch PVC for the top and bottom of the box. I was able to cut these pieces and shape them to fit the radius inside the torso.
I mounted the light box onto two sets of bolts which were anchored in 1/4 inch PVC strips on each side of where the box mounts. These mounts were glued to the inside of the torso with fiberglass resin. I also installed the belly lights and belly lights micro controller circuit board on two custom PC board mounts. I made these mounts from PVC which I cut to fit the inside contour of the arm wells. I cut a slot on the inside of the mounts and slid the circuit board into place.
Here's a picture showing the lights turned on . The belly lights are blinking randomly at this point. It's really tough to get a good picture, not using the flash. With the flash, you don't see the lights.
Here's what I did with the Dialight lamp sockets, so that I could use the standard T-3 1/4 Miniature Bayonet Base lights. I removed the black plastic portion of the socket. The black plastic was press fit and could be nudged (lightly with a wood dowel and hammer) out the back of the socket. So I am left with the metal portion of the socket with a large hole where the lamp goes.