There's a couple different ways I can think of to do this.
First is to commission the design from a 3D designer and send it off to Shapeways to 3D print, since they can do some really nice detail work. That's probably the quickest but also most expensive option.
Any other option will require a lot of meticulous work from you on your own materials. If you have a rotary tool, you could probably make this out of metal, wood, Worbla, foam, etc. (different bits for each material, obviously). However, without years of experience, practice, and finesse, I doubt you'll get all the details that you want. But just the basics may be enough for you!
The last way would be to sculpt it out of clay, mold it, and cast it. Again, LOTS of meticulous work, but it will yield a highly accurate piece in the end.
Personally, I would get a quote from a 3D designer and see if it is in your price range. If they can do it and Shapeways can print it within your budget, that is probably how you'll end up with the most accurate piece.