Modular Synth Panels

I would like to make use of HPGL graphics for my panels, but I can't figure out how to do it. I have searched out this subject a few times over the years and I never seem to get anywhere. Is there some mojo about .PLT files that I don't know about? I'm having a hard time cracking this nut.

I'd be very thankful of anyone who would give us a step by step. i.e.: download this driver, I use this software, I export file as... etc.

Anything would be helpful really; links, search words

I'm using windowsXP and have Adobe Illustrator (if that helps).

Thanks,
p.