I bought the Lynx and Scorpion kits for my 10 year old, these might be a little challenging, he built both the Crossfire and Amazon in the TandemX kit himself. so far he did the motor mount for the Lynx, very helpful to see your build thread here.
When cutting the air intakes, not sure if it would help to poke holes along the line with a needle or other awl type of tool through the paper and the tube, then connect the dots with the knife. You can lightly sand the edges of the tube to smooth it out, and tack it down in a few spots, let dry, then give it a generous fillet of glue to make the seam look smooth. that looks like one of the more challenging parts of the build.
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