Time for the first build update.
I slotted the tube for everything first. I used a dremel with a carbide cutting wheel to cut the slots out. I used a piece of angled aluminum for my straight edge to mark everything.
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The tube seems to be holding up to these long slots very well. There was no need to worry about the length of the slots.
Nosecone coupler is epoxied inside. The metal tip is off until I paint and finish the nosecone.
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The first two centering rings are on the motor mount.
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The fillets here have been sanded and are not absolutely perfectly smooth, but they will certainly be strong enough. The underside of the lower centering ring does not have a fillet to facilitate the fin tabs. The fillets on the underside of the upper centering sagged more than I would have liked, but it is not really an issue. I should have waited a little longer for the epoxy to firm up.
I have a decision to make here. I can either use a 1/4" forged eyebolt that will fit through a hole I drilled in the upper centering ring, or I can wrap some kevlar around the motor tube and epoxy it in place. For the eyebolt I will have to find a nut that will either fit against the airframe as the ones I have do not, or just embed the eyebolts threads in epoxy to hold it in place. I have some 1/2" kevlar I can wrap around the body of the motor mount and epoxy to the eyebolt to reinforce it's mounting if it needs it. I know epoxying kevlar directly to the motor mount works, I just have heard that epoxy makes kevlar brittle. I have used epoxying shock cord to the motor mount on my 2.6" Madcow Screech, but that is only a 5 lb rocket, not 30-35 lb rocket. The eyebolt also gives me the option to change out the shock cord.
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