Time for something new. I've done a lot of the nosecones in my inventory, and I've started to branch out into new territory. So, rather than filling up my Nosecone Library with other parts and assemblies, I've opted to create a new thread. So, with that said here's a collection of assemblies that just about every rocket would have... Engine Mounts. BT-60 Motor mount for Estes E engines that you can copy and paste into your sims. And one for C-11/D motors Those sims are based on Estes' centering rings that were laser cut, and were measured with my digital calipers for accuracy. Below is a 24mm x 70mm BT-55 engine mount using wide cardboard rings. I've also uploaded a BT-56 engine mount for a 24mm x 70mm powered rocket, you can download that below. One way of using these sims are to open one of them, next save it as the name of the rocket you're building, then change the length of the Phantom BT-60 to the length of the body tube you're using for your rocket.