User:ChryslerFan1986/Wiki farm plan

I am trying to create a wiki farm where all wikis have installations customised (e.g. some have FlaggedRevisions, others don't, some have Extension:MultipleUpload etc. but not all do). However all will have the following extensions:
 * CheckUser
 * Oversight
 * Extension:InterWiki

I tried Extension:Farmer, and it was partially suitable, but hard to configure.

What I would like to be able to do:
 * Install the MediaWiki install script once
 * Use a CommonSettings.php, and ensure LocalSettings.php redirects to it, if this is possible.
 * Not have to manually install it every time (as I am currently doing now!)

Any help, leave a message on