Questions for more advanced programmers on this project:
1. Can C++ be used to code scripts in RPG Maker?
2. Is the time period for this project (3 months) unattainable?
Not really interested in joining this project, but I can answer some questions.
1. No it cannot. The only language you can use for scripts in RPG Maker is Ruby.
2. That depends on a lot of factors. It depends on the size of your project. The amount of team members, the members skill, the amount of time you put into it daily. So unless you pretty much create a schedule, you can't really be sure. It is possible, but I don't know enough about your project to know.