The channel tunnel stripes are cut from 3/16" basswood.
The laser cutting leaves black ash on some of the sides. This should be cleaned off with 400 grit sandpaper on a block.
On the right, notice the top is cut at an angle. All ends will need to be squared off as you'll be joining two strips on the longer, lower tube.
All six tunnels are held down on masking tape with the sticky side up for spraying with filler/primer.
The filler/primer will seal the wood and after sanding will fill any small pores.
Here's a before and after light sanding with 400 grit on a block.
The sanded tunnel is on the right. Notice some of the filler/primer is left on the surface filling any recesses. Sand too far and you'll end up with a rough surface when shooting the white undercoats.
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