Been a long time since I been on the forums or used the mod, just wondering if theres a way to use the mod on the four vanilla maps.

I have been wondering the same thing. Please help I really want to mod Nacht Der Untoten and add perks and maybe a pack a punch machine. I know there are maps already like that but they add more rooms to the map so it basically rids of the original train strategies. How would we convert the files to a map file so we can use script placer then open up the map file in radiant in the launcher program? Does it involve the ff file? What folder exactly are the original maps at?