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NOTE: The cabin top spruce pieces are precut. Do not cut up longer pieces of spruce for the cabin top. Make certain you understand the location of the spruce pieces in the fuselage before beginning to build it by studying the plan.
The spruce is indicated by call-outs and by a different wood grain than the balsa. Note the splice call-out located just above the "Landing Gear Detail" isometric drawing, which indicates the point at which the balsa front piece ends and the spruce rear section begins.