I'm sure it's possible... but it would look out of place (in my opinion). Also, you shouldn't need one because of the slope of the window. The wind blows over it and should blow the water and dirt away. I've never had any problems with that. I know on minivans or SUVs they have rear wipers because the aerodynamics create a vacuum behind the car and the wind doesn't blow the water away... it just sits there unless you have a fin like some of the early 90s blazers did. The early 90s acura integras are the only cars I know of off hand that had a rear wiper with as steep of a rake they had on the rear window.
Here in Michigan we get quite a bit of snow. It would definately help to have a rear wiper. I was wondering about how it would look also but I had a first and second generation Probe, they both had sloped windows and they came with a rear wiper.
I've also thought about a rear wiper. The only thing it would be good for is snow though (and being different).
The only problem is where would you mount it? Most cars that have them are hatchbacks so the rear deck and the rear window are integral. We have a trunk right under the window, so it couldn't mount to that. Mounting it above the window would just look silly. I really can't think of anyway it could be accomplished and look good.
I find when I drive at night when it's raining, I can't see well at all out the rear window. There are raindrops all over it. I was wondering why a rear wiper wasn't included??? I never had this prob on my 1988 Dodge Aries. The window on that thing was almost straight down.
For CAD packages, I mainly use Pro/E. I know AutoCAD rather well also. I know a little Cadkey and SDRC-Ideas.
There is so much more I want to learn. But hey, I'm only 25 and 1.5 years out of college. So I have plenty of time! I really want to get more into surfacing and rendering, but at the same time I want to get more into product develpment and other stuff that might take me away from purely working on a CAD program.