OK, here's the deal. My biggest mistake was a doozy (sp?). I made a bunch of cabinets for a restaurant. I was also reponsible for the bar top, which was to be made out of galvanized metal. Measured for it, and found a place that could produce it. Took forever to get it, and headed for the install. Once I laid the metal on the bar, I realized it was too short. HUH??!! Livid, I went back to my dimensions and realized that I had written down 13' 1-1/4", but had told the fabricator 131-1/4". Ouch. A two week wait for a new piece, are you kidding me? In the end I made a wooden filler to make up for where the metal was short, and this unusual looking area became the servers' station at the bar.
How about you? Can you share a woodworking gaff with us?
G