I recently purchased an Estes designer box, I'd like to start working on my first scratch build, and I'd like that to be a low power multistager (B or C motors). However, I haven't built a multistage rocket before and I have a question regarding mounting the engines. In the Handbook of Model Rocketry, Stine talks about the ability to lengthen the booster stage by up to 12" by venting the body tube, rather than taping the motors together. In this configuration, what is the best way to mount the motors in their respective stages? Do I go about it the same way as building a single stage motor mount, or does the mount in the second stage need to be specially constructed?