I have been using AutoCAD since the days when it was a DOS program only, and I would not recommend it for such mundane tasks as model airplane design if you do not already know how to use it. It works for me because I am very familiar with it, but it is much too complex and powerful. The learning curve will be very steep.

Turbocad is probably a better choice, and it will open .dxf and .dwg.

Les