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I haven't done AutoCad in a long time, but what I found:
Scan2CAD (software) can be used to import drawings into AutoDesk (AutoCad). You'll lose some resolution and will probably have to clean up exact dimensions.
Autocad can natively export to iges file type, which can be read by SpurtCam.

Autocad can be amazingly complex. I was taught to use it in school, but lost most of that knowledge. I started using it again about 5 years ago when designing a home and that's a very simple case. Lots of tutorials and etc on line, I'd say reasonable learning curve for 2d stuff. If you've never used it before it'd be totally worth taking a community college class on it. There may be easier and less expensive software if the case is doing CNC.

CNC is, of course, 3d.. Almost everything I can think of including simple cutting is multi-pass set depth for cutting.
Interesting project. AutoCad is very expensive of course.. If you're a "student" there many be options that make it affordable - or at least worth taking a class to become a student.