There are websites that sell 3D Models. If your need is not
original then there is a good chance that it has already been
modeled. Like anatomy: "there's nothing new under the sun"
so why draw it again if there is a quality model in existence.
Once purchased then have it edited to suit your needs.
If you believe that this process may suit your needs then
contact me and I will be happy to help you at any level. Please
do not try this on your own if you are not a CAD professional.
Below are links to some sites that I have used: