@Siromber: I'm going to guess build a new game from the group up. Unity 3D is a game engine, so that implies something new.
@WarLordXbolt: Hello. Welcome. Can I ask what sort of background you have? I assume you have a bit of programming background. Do you have any experience working with game resources? Have you built anything before? I get a sense you're probably a little new with the tools you want to use. In which case, the best way to learn is to start playing around with things.
It's a big project to remake a game like Outpost 2. I guess what people are wondering is, is this just wishful thinking. I say go ahead and think big, but you do need something small to focus on, especially at the start. Best of luck if you decide to go ahead with this.