My personal taste, but think 'epoxy' not CA. CA is fine for little stuff and R/C apps. I think it is too unforgiving in the larger rocket realm, plus it tends to be a bit brittle. I like the longer setting type (30 minutes) because it penetrates well and gives you plenty of time to make corrections. Quite strong.

Enjoy the build! A Saturn V or worse, a Saturn 1B, is a lot harder to construct.
Since you have not built one this size yet, it will be immensely satisfying when you are done. It's a great semi-scale model, too!
Pics as you go???

Allen