If you think extending it will spoil the look, maybe make a mount that slips into the existing mount to move the motor aft? The issue I see with the current configuration is that you are going to toast the fin tips pretty badly, I think.

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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