The rocket construction is very easy. It is built entirly out of 1/4 inch foamboard. Foamboard is available
at almost any arts and crafts store like Michael's or Ben Franklin's, or you can find it sometimes at Walmart.
I first cut out three 6" X 7.5" rectangles out of the foamboard. When I cut out the rectangle I used a matt knife which can cut at either
a 90' or a 45' angle depending on which side of the knife you are using. Cut the foamboard so the left and top edges are at a 45' angle
and the right and bottom edges are at a 90' angle.
Next, mark the foamboard on the top right edge and bottom right edge at 6". Use a round edge (I used a small plate) to cut the arcs in the foamboard. The arc goes outward on the right edge and inward on the bottom edge. Then glue the 3 pieces together. After the initial setup is dry make three strong fillets along each edge.
The bottom piece is a simple equilateral triangle 7" on a side. Glue that into the bottom after cutting out the hole for the 32mm motor tube. After the initial glue dries make three strong fillets along the dges of the triangle.
The motor tube is a 3 1/2 " piece of BT-55 body tube. When the glue has dried on the fillets you are ready to install the motor tube. Trim the edges of the motor tube so they will fit flush on the inside of the pyramid. An easy way to do this is to first mark the tube at 120' intervals around the edge. If you have an Estes fin marking gauge it is easy. Then trim the paper away in an arc above the marks you made on the tube. Then glue in the motor tube.
Once the assembly is dry drill a 3/16" hole next to the motor tube and out the middle of one of the sides. This will be used to install the launch lug. I used a 3/16" launch lug but 1/4" would be OK. The cardboard tube an igniter comes in works great. I happened to have some 3/16" ID plastic tube around so I used that. Finally, put good fillets all arond and you will be ready to finish the rocket
Finally paint or cover as desired. I covered it with monocote because a lot of brands of paint will dissolve the foam in the foamboard. I understand that Testor's paint available at hobby stores will not melt the foam. Monocote is a heat set plastic film used in R/C airplanes and is available in a variety of colors. I used pink, yellow, and orange because I had it available from a previous project.