UFO Minature Model Design

NOTE: I have tried using blender to build this myself but it’s a learning curve I’m coming up against (files attached but they are not great). I need some expertise.

I am starting a small business and wish to get a stl design quote on a prototype miniature (file only)

I handbuilding these but it is very time consuming so I want something good-to-go that I can airbrush and add with items to sell

I have the spec below that I would like a design quote for
Schema:
• Overall length (nose to tailend): 120mm
• Tail length: 10mm
• Maximum width (side-to-side): 60mm
• Overall height (top to bottom point): 40mm

Helpful Context
The Calvine Ufo - https://en.wikipedia.org/wiki/Calvine_UFO_photograph

Minature – Resin(? For smoothness) – Geometry only – Smooth surface texture I can airbrush