From R.Rhea via Bill Fane comes this invoice for a CAD workstation in 1981. I've left out the customer and sales firm.
I couldn't find a picture of the Omnitech TM-1 workstation, although Omnitech is still around and today produces CNC machines. Here is a picture of the Techtronix display, which was a vector display -- it displayed graphics as bright lines on the green background. (Unlike today's raster displays, it needed no memory to remember the display refresh.) I remember using one in about 1980 while still at university.
Here is a picture of the CalComp flatbed plotter (both pix from Wikipedia). It's nearly as tall as a person: