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Pictured here is the classic GI Joe 9" capsule easily found via eBay auction.
Step 1: Remove the Retro Pack
Step 2: Remove the Heat Shield
Then use a razor knife to break the glue along the seam between the capsule shell and the heat shield.
Step 3: Remove the Capsule Floor
Step 4: Removing Other Parts
With a 3 1/8" hole saw, cut a hole in the nose of the capsule in preparation for building a parachute chamber.
Step 5: Remove the Instrument Panel
That ends part one of the process. You should now have a nice collection of capsule parts, ready to work with.