Estes Delta Wedge Clone #1931 Build, Part 3, Engine Mount & Wedge Fins

With this build first attempt a year ago, I can't find some of the pictures. The Estes instruction illustrations will help here.

Draw a line between the two outside points of the back plate for alignment.

Use a four fin alignment guide to mark the body tube.

The back plate lines align with the lines drawn on the tube. Glue the tube end flush with the back plate.

The two wedge shaped fin fold lines are embossed with the butter knife and straight edge.

On the left, you can see how little glue is needed to assemble cardstock. 

The leading edge is burnished shut.

Here's probably more glue than is needed to set the two wedge fins.

Placement is shown in the next post.