The first step for my build was the payload section.

I made the payload tube extra long - as long as the payload section, and extending down into the paper transition. That gave me internal support for the transition. A slightly undersized centering ring was slid into the transition, to assure that it was forced to be round.

At the base of the transition I converted a BT-60 coupler, a plywood bulkhead, a centering ring, and some other scrap parts into the shoulder of the payload section. That was attached to the base of the BT50 payload section, and the transition was slid down onto it. After being glued, it was a really strong section.

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