There are quite a lot of manuals available in either paper or scanned, and also quite a lot of flyers. These are the manuals I have...
http://www.paulswan.me/arcade/manualsUS.htm...that's slightly out of date.
In your classification, the UR3 series were the MTC-900 ones and the UR2 series the KT-3's, I think. You'll probably want to call out the B&W vectors as a separate class of cabinet.
There two flavors of UR1 - the colour ones (Astro Wars/Galaxia) and the B&W ones (Dodgem, The Invaders). Further, there's The Invaders (dedicated) and then there are some one off B&W's (Circus, Off Limits) before that, even.
Best bet is to put what you have on a web page and we'll all chime on what should be where

Great effort!
Paul.