my point still stands. you're trying to run a marathon before learning how to walk. if you're all serious about making maps and stuff you need to learn how some things work in the engine. and what you're asking is still as simple as making a door. it only requieres some scripting and you're done. and your map is still pretty fucking far away from being complete so i suggest you focus on mapping which is what's more important than stuff like that. you'll eventually figure it out on your own anyway.