Cilla,
You floor exploits remind me of my first major home re-modeling effort.
We had purchased an old house in Norfold Va and the door to butler's pantry was missing its frame. I bought the proper lumber, a miter saw box, etc. measured three times and cut once. I made what I would consider a near-perfect door frame.
Then I discovered the ugly truth - no way was that door way square!
So I had a perfect frame surrounding a crooked dooway and it looked like something from a fun house!
der Brucer
Wait until you try and tile an un-square floor!