In the particular case of Siemens, they already did that for you.
(Migrating from S7-300 PLCs to the current S7-1500 range, I found the complete documentation package for the 1500 universe in one whopper of a pdf. Just north of 11,000 pages IIRC.)
I shared the OPs frustration when working on the S7-300, though. The docs are excellent, there's just so many of them...
