I work in a medium size historical society and I often use a very cheap CAD program to "sketch" ideas. Its by a group called EXPERT software - I found it in the cheap section of a national software chain in a mall. It cost about 20 bucks and is not real fast. I don't use it as a drafting program but as a sketching program-after I do a virtual walk through I modify the design and work in a drafting program. I have not seen any high end CAD prgorams myself. I always wanted to be able to scan a picture and put it in a virtual exhibit!!! Just a bit beyond our museums budget (or needs.) Good Luck Patrick Reynolds