Well, when You have a hammer over head You make a hole instantly.

Now the steeps:
1. Peeve Your wife.
2. Export the mannequin as object; import as door
3. Insert it in a straight single (not splinted) wall. Will make the cut over contour.
4. Modify furniture -> Modify texture -> select all -> Invisible ->OK
NOTE: It don't work on angled or curved walls even for simple forms.