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Pictured here is the classic GI Joe 9" capsule easily found via eBay auction.
Step 1: Remove the Retro Pack
Start with cutting off the Retro Pack, a razor saw along the joining edge works.
Step 2: Remove the Heat Shield
Just under the heat shield are 6 studs to cut, razor saw them in half.
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
Use a razor knife to break the glue along the seam, once done the floor plate will lift right out.
Step 4: Removing Other Parts
You can now lift the plastic sliding window out.
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
With the razor knife break the glue for the panel
That ends part one of the process. You should now have a nice collection of capsule parts, ready to work with.