Step 4: Robot Shell:
Drill holes in the end cap for the eyes and in the body for arms, belly button, satellite pole and wires. I use a hand drill and go slow, starting with a small bit and stepping up bit size incrementally.
I made the mouth with a Dremel and a cutoff wheel, but a hacksaw would work fine.
If you're feeling fancy and/or have them on hand finish the holes with aluminum grommets. On some I just used rivets for eyes on others it's a grommet + rivet mix.