Roots Supercharger Rotor Profile

I wanted something simple so I wanted to see if I could make the classic roots rotor profile in cad. Doing so I discovered why my wooden rotors didn't mesh properly. I totally cut the rotors wrong, but the proper profile also seems rather simple to make.

Now this looks much better, I'll post the actual dimensions and drawing later...

Even though I designed this in a CAD program it still seems like it would be possible for the layman to make a real supercharger.