I'm installing a full bathroom in our basement in an odd space and need to put a door perpendicular to two walls. The space between the two walls is 34" with a triple stud on one side and a double on the other. I'd like to be able to get largest door in the space. I could go with nailing a single cripple stud through the face to the ends of these studs on both sides of the frame and end up with 31" rough opening, but is that sufficient support for an interior door? Thanks for the help.