Illusion...sounds like you're aiming to put something similar to Skruface's "what to upgrade and what not" (something like that) for AEGs.
I've always found that write up to be extremely useful as a reference. Concepts of high-speed vs. high-torque remain constant regardless of tooth specifics, brands, etc...
If it's along those lines, it'll be very useful...if it's in plain english, it'll be widely accessible.
I only hope that you put in a highlighted note at the beginning of each post that reads:
"
WARNING - monkeying around with perfectly working GBB is a great way to destroy it quickly"