I uploaded this a week ago and posted it over in rc10talk, It may help you as it has an excellent cross reference section. Say you were looking at a UM-14, it shows you all the kits that used it (as of ~1990). It also shows exploded views of many kits and lists the parts that make up the kit.
This is a large download- about 280mb. Password is "kyosho" with no quote marks.
Enjoy!
https://www.idrive.com/idrive/sh/sh?k=p0e7v9e8h8