The home of Claudia was... -SPOILERS-

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I think what you write has to be true otherwise the whole thing doesn't make sense. Not that sense is required, but I can't imagine the creators of this project to be hodge-podging along and say "Oh! Hey, Monica, why don't you play Claudia too!?!" That will save some cash and cause people to speculate as to why and then maybe one of them will come up with what this is all about!"

The similarities in dialog between what Claudia says to Bruno and what Vera says at the end strengthen your theory.

The birth canal part is a little odd. When Felix broke through at the end, I immediately concluded he had been in his own house the whole time living as a stranger or ghost.

This was a pretty good thriller sans all the metaphor except for the comedic moments, and by that I don't mean the light-hearted segue as Felix settles into his new home, but the ridiculous way some of the dialog went down in hyper-expository manner.

I laughed at the end of this film and thought it kind of silly until I came here and read some of the theories. I suppose there was a reason I was interested in further exploration of the film as opposed to simply dismissing it. In the end, I think it was an ambitious project, wonderfully imagined, but could have been executed better. The ideas were there, solid, but they could have benefitted from another pass through a better script writer.

This is basically correct. The ending gives away the psychoanalytical premise of this. The symbolic child and the resentment of the child by the father.

The whole film thus cannot be merely comprehended literally, because it attempts to explore subconscious states. There is no real man in the house - no crime, no perpetrator, no good guys or bad guys.

No doubt a disappointment to those looking for a straightforward thriller. I think this was a bit too obvious if anything - the symbolism layed out thicker than in Bunuel.