Take a look at QCAD [
www.sillub.com, also published CAM Expert, a
computer-aided manufacturing software] or LinuxCAD [Software Forge], or
see if you can run a Windows-based CAD app under Wine. I have dosemu
running under Fedora (although am having some mouse related troubles
with SilverScreen version 4.4, a 3D CAD/Solid Modeling Software I had
since 1995, dosemu does work).
-Wayde Gutman