In 10 years if it takes that long, everybody will be able to afford a combo machine ( a Star Trek replicator) that can basically make whatever they want. Pick a model rocket from a catalog online , and have it 3D Printed/LaserCut/CNC Machined/Hot wire Cut/Laser Engraved/Painted and RTF and then you select the engine and the combo 3D Printer/Laser Cutter/Hot Wire Cutter/CNC Machiner/Laser Engraver will make your engine for you.

IF I was Estes I would create .stl (or 3DMax) files for everything they ever created and sold..... You know somebody somewhere right now is creating a digital .drm for these kind of files so everybody will have to buy them.

Terry

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"Old Rocketeer's don't die; they just go OOP".....unless you 3D print them.