I have been testing a cutting design program called MAKE THE CUT is is a vector cutting program used in the crafting, vinyl ,paper cutting world.

My wife and daughter use it for crafting with a CriCut. I was watching them work and noticed they were doing the same things I did for plasma only they did it 10 times faster than I could and in some cases did a much better job of it.

SO after a little studying and testing it is a VERY nice program that CAN be used in plasma design work. It outputs in several of the native Vector modes and it is possible that they could write a plugin to output it in DXF format as well.
I take it from SVG straight into Scam.

Might be worth a minute to check it out, the price is VERY reasonable. and the support seems top notch.

Just a thought, (;-) TP

FlexiSign also works very well, and outputs a good quality DXF.  Most of my drawing is technical in nature, so I mostly use Rhino.  The full blown version is expensive, but they have a version called FlexiStarter for $99.