New World!

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So after the good reception I seemed to get from 'Slimbo's Grand Day Out,' I feel pretty good now about modding and want to try something a bit more ambitious and serious. My idea here is that you are given a bounty hunting job by the NCR and it takes you through a tunnel and out into a small or medium-sized valley which has little pockets of life here and there throughout its desolate  and rocky land. I won't talk about the story right now, but I want this mod to have an emphasis on exploration and the land you find yourself in.

I was also thinking it would include a companion but of what sort I'm not sure. If anyone who sees this has any experience or understanding of building new lands through the G.E.C.K, would you have any advice for a newbie like me? Would be appreciated. : )