I have been having this problem aswell. Cant link a custom interior cell to new worldspace. But can link the new worldspace to tamriel. So what i was thinking is linking my interior cell to tam then a hall way to the door linking to my new worldspace. I tryed it out ingame and it seems to work. A little of a rush/proof of concept job tho... adding 2 new doors just standing there outside of riverwood(as its the one place all my toons can get too). http://img685.imageshack.us/img685/3568/screenshot12i.th.jpg http://img543.imageshack.us/img543/5639/screenshot13blc.th.jpg This is a new worldspace using tam as a perent. Its all messed up looking but its not going to be visible from the mod im making. http://img26.imageshack.us/img26/7218/screenshot15rg.th.jpg Im thinking of putting the 2 doors and a hall under a mountian or something. to keep it out of sight. kinda a pain to have 2 loading screens right after each other but. i dont feel like scrapping the whole thing just yet. The screenshots of just proffs not the actual mod fyi. update: ok you cant put it below the ground! you just pop up... update 2: Ok putting the little hall and 2 doors in a cliff worked. But you get the weather effects of where ever you put it. WTF this is dumb. lol. ah wells maby im overlooking something and a nother way to fix this. but for now my tomb is going to have a little odd hallway. >.> update3: i made another worldspace and didd the same thing to it. it works too. this will have to do for now. maby if somebody can figure out a betterfix or if a patch fixes it i can remove this pointless hallway in a cliff O.O