I cut out the centering rings and glued up the BT-5 tube arrays as shown here.

I found a scrap piece of steel tube that I sharpened with a grinder, and punched out the BT-5 holes. Later they would be sanded with sand paper glued around a dowel.

The outside diameter of the Centering Rings were cut with scissors and stack sanded to size.

I cut nine pieces of BT-5 to 4 inches long.

I marked the BT-5s 1/2" and 1 inch from each end, and glued up these "BT-5 arrays" which became the tube couplers.

I then joined the main tubes by gluing them together with the BT-5 arrays. Use care to roll the main tubes on a flat surface to keep them in alignment.

Most of the balsa stock that came in my box-o-parts was small bits, old die cut skeletons and miscellaneous bits, so I thought that a mixture of tube fins, balsa and tube tips would make a nice design.

I cut the top tail ring with the patterns in the pattern section.

I got two pre-cut fins that looked great as lower fins. I attached 4 inch sections of BT-5 tubing to the fin tips and capped them off with some wood buttons that were rolling around in the bottom of the box-oparts.

The top tail ring is glued flush with the rear of the BT55 using the tube marking guide included.

Next I glued an 18 inch piece of BT-50 inside the top tail ring and along the top mark on the rear most BT-55

Attach two 6 inch BT-20 sections at the junction of the lower fin/ body tube junction, flush with the rear tube. I capped them with some larger wooden caps from the ole-box-o-parts.

I glued up a 24mm engine mount for the main, central tube. I cut a BT-50 section, 2 3/4 inches long, and glued a 20-50 Centering ring flush in one end as an engine block.

I had a pair of 50-55 centering rings that completed the engine mount. One centering ring is glued flush with the engine block end, and the second is 1/2 inch from the rear end.

The 24mm engine mount was glued into the main tube, with the rear ring flush to the end of the tube.

I found some more pre cut fins, and attache them at the junction of the top tail ring and the main BT-55.

I made up an 18mm engine mount for the upper BT50 tube. I cut a 2 3/4 inch piece of BT-20 and glued a BT-20 engine block flush into the front end. I salvaged this long 20-50 centering ring tube from a Estes Athena that was in my box. I also used the Athena nose cone on the front of the upper tube.

Next I glued the 18 mm engine mount into the upper BT-50, leaving 1/2 inch hanging out.

I glued 3 inch sections of BT-20 onto the tips of the upper fins for more stability.

I found a smaller version of the two precut upper fins that I used as the top fin. I glued it on the center line, flush with the rear of the top tail ring cut-out.

Next I cut two 2 1/4 inch sections of BT-5. I cut the rear of the tubes at a similar angle as the upper tail ring and glued them against the top fin. I then inserted two .650 diameter wooden beads and 1/8 inch dowels as laser guns.

I did get a pingpong ball in my box-o-parts, and I HAD to use it. I cut it to fit on the BT-50 and created a gun pod. It is glued 11 inches from the rear of the main tube.

I wanted a canopy on the nose cone. I found this triangular chunk of balsa in the box.

I made some angled cuts and sanded the underside to the approximate radius or the nose cone.

I attached the canopy to the nose cone and two 1/8 inch x .680 long "guns" on 1/8 x 1/4 inch balsa gun mounts.