I haven't done a lot of additional work on the design. I'm not sure that I'll remove the material indicated in red in the first image, back cuts like that can prove to be pretty time consuming. I should be able to shorten the shoulder a bit once I add the bolts into the design; that would make it a bit easier. I'm not too concerned about making as lightweight a motor as possible, but the aft end of the motor is a good place to remove weight from since additional weight in this area pulls the center of gravity aft. This isn't necessarily what you want since the likely result is larger fins to compensate. I'll wait and see how it goes while I'm machining it; I can always revisit the nozzle at a later date.
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