Bernard,

From the appearance, it looks roughly like a close scale-up of the original. The Augie II (Estes Plan #28) was BT-60 to BT-20. This kit is 2.75" diameter, so that is the LT-275 body tube. The description says heavy wall tubes, so that would put the upper tube at the LT-125, which is 1.25" ID. Looks like the Chute Release will not be an option, which is too bad.

I'm thinking that an easy solution for scratch-building that could use the Chute Release would be BT-60 upper, with BT-100 lower. Almost a perfect upscale of the original Augie II. The BT-100 is available from eRockets. It would not be heavy wall tubing, but neither is the Star Orbiter. A short section of BT-100 tubing could be slit, and installed in the bottom end of the BT-100 lower tube to toughen it if desired.

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Lee Reep
NAR 55948

Projects: Semroc Saturn 1B, Ken Foss Designs Mini Satellite Interceptor
In the Paint Shop: Nothing! Too cold!
Launch-Ready: Farside-X, Maxi Honest John, Super Scamp