Semroc Wac Corporal Build, Part 7, Forming The Tunnel

 

I had started forming the tunnel when I had worked on the build before.

Sand the underside curvature by wrapping 220 grit around a body tube. Sand straight up and down motions.

TIP: You'll get a tighter fit if you sand the inside contour on a smaller diameter body tube. The kit tube is 1.17" diameter. I sanded the underside of the tunnel on a slightly smaller .976" diameter BT-50 tube.

Here's the side of the tunnel before shaping the end.

Sand the angle diagonal first.

Round off the ends. 

Round off the long sides.

Here's a good fit of the tunnel on the body tube.