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use a flap sanding disk on a rod with a drill. Still mark it so you know where you are sanding. Don’t need to sand the whole thing, just the spots where you are glueing.
I second this idea, though I believe the entire area will need to be sanded as the inside of the main airframe will receive coupler assemblies that will run the entire length.
I wonder of you could fab up a sanding flapper with a long dowel and some 220grit. say cut a slit in the end and slide the paper in that then secure the other end to your drill via a hole bored down the center that is filled with a piece of steel rod. doesn't need to win a beauty contest, jut needs to work