That is a very, very, very nice installation David. I was looking into light balsa and laminating it with CF for the Tiger Tail III, but I kept looking back at the 1/8 ply trays I used to hack and saw up back in the day. Did you use 1/16, 1/8, etc? I was thinking of using basswood to save a few grams or simply the 1/8 ply with lightening holes, on rails.
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