Just plain WRONG.

There is no such thing as an official "AMA qualified trainer" Nowhere will you find an AMA document to support your claim! (on either the qualified trainer OR the need or a permit!)

There are designated trainer or instructor pilots within some clubs. Some clubs have a qualification requirement to become an instructor... The AMA lists SUGGESTED qualifications for the Intro Pilot Program... There is no OFFICIAL AMA designation for a "qualified trainer"

Unless your state law requires you to get a permit to buy the rocket motors, there is no permit needed. But that's got nothing to do with AMA rules.

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On my installation... I routed a section of model rocket tube to allow the ejection charge gasses to exit the fuselage. You can also put a balsa cap on the motor mounting tube... and rig the tube to lock the rocket motor in place more securely (can't allow it to eject or it does vilolate a detail of the AMA rules)