I also did an oven/microwave replacement that required cabinet work. The home was custom built for the previous very tall husband and wife. The built-in microwave above the oven was so tall, I had to use a step stool to reach it! When I was admiring a new Kitchenaid combination oven/microwave unit at Sears, I was referred to a contractor who could do the cabinet modifications to bring the height down to a more user-friendly level. He came to our house, proposed what he could do, and gave a reasonable estimate.
Alas, when he tried removing the existing oven and microwave, he failed to notice that the units were not attached to each other, and the microwave began sliding off as he was removing the oven. He managed to catch the slippery microwave before it crashed to the wood floor, but not without gouging the custom oak framework in 3 places on the adjacent doorway. He apologized, and said he would repair the damage.
He completed the interior cabinet work and installed the new combination oven and microwave. He then said he would return to fix the damaged oak frame. He never did return, and he never mailed us a bill for the significant amount of work he did. I guess he decided it was a wash.
Our luck returned when we discovered our neighbor was a retired woodworking teacher. He proposed making new cabinet doors above our now lowered appliance that perfectly matched the style and wood stain of the surrounding cabinets, and he repaired the oak frame. He quoted us a fair price, and the work was absolutely professional. I could not have been more pleased with the work.