Okay, as someone who has been in a wheelchair for most of his adult life... I believe I can contribute to this topic with some "insider perspective".
Here are some situations I have encountered at my local arcade.
- Controls too darn high!
Granted some uprights don't suffer from this, but the older games such as the streetfighter 2 CE's are tough without switching to a high barstool to play (which most of "us" can't do too easily.) Most Neo Geo cabs are cool in this area.
- Monitor too "deep" or at a bad angle
Think some versions of Time Crisis. (here is a pic:
http://www.wailee.com/sys/lpic/Time_Crisis.jpg I can't seem to embed images)
With a monitor like that it is impossible for someone at the height of a seated person to see all areas of the screen.
Also forget about cocktails -- there was an old Arkanoid and Galaga '88 cocktail I used to enjoy, but everytime I wanted to play it I had to have help to transfer to a high Stool just to see the screen at all.
The leg room issue has alrady been discussed and solved to my satisfaction
Let me also just say that I fully support this project, and also think a Wheelchair Accessible Pinball would be a very nice project as well.
If there is any other way I may be able to contribute, let me know.