The kit directs you to glue two lengths of a balsa strip for the long length of the single tunnel.
I didn't like the idea of forming a long, narrow butt-join piece. When sanding to shape, it could break at the small glue joint.
TIP: You might find it easier to shape a single piece tunnel. I cut a new one piece tunnel - 1/8" thick X 13 3/16"long.
Here are four new tunnels cut from 1/8" thick balsa.
I'm gang sanding all four at the same time for a consistent start shape.
Use the round end of the laser cut tunnel piece as a template to shape the replacement piece.
Rough cut with a knife, then round with your sanding block.
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