I think I will just say, What the Hell, and just start this. The first step, of course, is downloading the current mods and install FCOM, and to make sure I do it right.
1. Gather files.
2. Install FCOM and test
3. Acquire permissions from all authors
I guarantee you will get stopped right there. If you cannot get permission to do this, your idea is bust.
FCOM denies this permission for a very good reason: mod compilations are immensely unruly. People who use them tend to be ignorant of when individual updates are made and do not understand how to install them, so the compilation user needs to update THE WHOLE THING, upload THE WHOLE THING all over again, and then the users have to download THE WHOLE THING all over again just for that one little update file. Compilations get rejected because Team FCOM cannot be sure that the manager will be committed, and it makes it a nightmare to provide support if you were to suddenly say "I'm done" and stop updating the compilation. This eventually leaves everyone who uses it with outdated versions of components that cannot be supported. You would be sitting there twiddling your thumbs for almost five hours waiting for that updated compilation to upload, every single time a single file gets updated. Tell us honestly you would not get sick and tired of that after two times.
That is
immensely less efficient than doing the homework and downloading and installing everything yourself. The difference between your method and that method is although there is a rather large download for both the first time, for the DIY method, it's the ONLY time. You will not be required to sit through a 3+ hour download just for that one update to MMM or Warcry due to you needing to download EVERYTHING all over again to obtain it.
It's inefficient, it wastes bandwidth, and hurts everyone involved in the end. That is why Team FCOM opposes this and will not grant you permission to perform the compilation. I don't doubt your intentions, but I don't trust them, either.