This outside the typical Ecomodder remit; but perhaps aerohead will appreciate the historical insight.
The shape is double-ended with a straight center section, derived from a boat-tailed supersonic military bullet. None of the 30-70 forward bias one might expect.
He goes on for over an hour, but never gets to my favorite modern rocket, the Rocket Lab Neutron.
https://img2.cgtrader.com/items/3469...blend-gltf.jpg
This has a boat tail more similar to the 19th Century military supersonic bullet, plus tail fins with minimal frontal area.