- last post: 01.01.0001 12:00 AM PDT
Long answer: You can buy a mod unless the creator has a financial agreement to pay royalties to those who own the franchise and the code. It would be illegal for the SE team to charge for this mod on the basis that they'd be marketting other people's creations as their own.
Short answer: No, it'll be free, garunteed.
Btw: ruined pain? I know where you go that from but is it just the name you've taken or was there actually anything in that mysterious file?
Not sure about your idea for that map, having different bases inevitably leads to unbalanced teams. It'll only be a matter of time before someone works out a way to exploit one or other of the setups to make the game unfair.