You don't really need to even purchase the MR, with the fin patterns that are out on the web. Then you can buy the appropriate body tube and other hardware from your favorite supplier.

My modification may be useful to you though.

I cut out a fin from 1/32" ply, then applied the balsa fins over that. makes keeping the leading edge a lot easier.

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Dreaming of making the rockets I dreamed of as a kid (and then some).

"The Guide says there is an art to flying", said Ford, "or rather a knack."
"The knack lies in learning how to throw yourself at the ground and miss."

Launching is Optional... Landing? That Depends on Trees.