There are several very good true CAD systems for cheap, or even free. For years, I used QCAD, which does AutoCAD DXF/DWG files. It's only $40 and works great. There are numerous free CAD packages, some good, some not so much. But I'd bet virtually any of them would be better than CorelDraw, which was never intended for doing CAD - it's for drawing, not drafting.
Regards,
Ray L.