Gotta love scale rockets, especially the black brant - building the Polecat brant as well - high quality kit, great customer service. I did tip to tip fiberglass on the huge fins and will also use a 1 inch band of the tube in the middle of the Av bay to allow removal, switch, etc.. I also added another 1/4 inch centering ring on the aft end of the motor tube to beef it up for the motor mount. The body tube seems pretty strong with the layer of fiberglass. As some have mentioned, will require some filling and sanding. The Av Bay/Coupler fit is a little loose, might add a layer of fiberglass to the av bay to tighten it up a bit. Curious from others if they have added a layer of 3 oz glass to the Polecat body tube (both sections) to smooth it up some, and / or for additional strength or any recommendations there for K or L motors.
Michael - you have a rocksim file for your brant ?
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