Homemade or a 30 billion dollar research ?

Handmade, with a bit over 1 billion dollars R&D.

Here is what the back of the LM looks like under the skin. Note that the thin outer panels attach to the small frames to minimize heat transfer to the aft electronics bay, underneath. Also notice the much sturdier frames that provide the true structural strength.

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"Transport of the mails, transport of the human voice, transport of flickering pictures - in this century, as in others, our highest accomplishments still have the single aim of bringing men together." St. Exupery