The nose cone on the motor section of the original is a 50J. You could give that pointy cone a flat top to more closely align with the original.

Here is my scratch-built 2.3X collection of parts. Six nose cones done, three to go.
I thru this picture together last year. Ducting tubes are not full length, I need to splice extenders on. Upper tube nose cones are reversed, the original used a 50K (Alpha) cone on top, a long 50Y at the bottom of the tube.

One of these days I’ll get those nose cones turned, and finish the build.

Looking forward to seeing yours completed.

Attached Thumbnails

 

__________________
Lee Reep
NAR 55948

Projects: Semroc Saturn 1B, Ken Foss Designs Mini Satellite Interceptor
In the Paint Shop: Nothing! Too cold!
Launch-Ready: Farside-X, Maxi Honest John, Super Scamp