Personally, I believe there was more creativity in those MRN Plans than there was in the main Estes kit line. Only a few of those designs were converted into kits: Big Bertha, Sky Hook, Cobra (K-10), and Mars Snooper, IIRC. There may have been one or two others, I don't remember them at this time.

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'Til next time,

Mike Toelle

NAR 31692 L1

SAM 0373