Okay. Now I'm making this neat-o curved bulkhead/hallway. I've managed to make the doorframe , but I can't figure out how to do the curved corners (I want them to run the length of the hall, like the flat portions. I figured that a bevel would be good but it doesn't work - bevels are only visible from the outside, not the inside looking out, if that makes sense. Any solutions, anybody/Echoman?

Did you try making a bevel and hitting Ctrl + i? (to inverse it, so that the texturing will be shown on the inside). You can always make a patch mesh

Hey, it works! Thank you Bombay Zeus, and thank you ctrl + I!