microwave replacement and venting

When our Sharp died, they replaced it. Unfortunately only the outside was the same dimensions. The interior was sooo much smaller. Being fulltimers with no oven, I need my micro/convention to cook so I got a refund and we found a residential Sharp. When the fellow helped Dutch set the box inside our Carriage, as we had to get to an RV park to work on it, the guy looked at the box then the opening several times and finally said "you're going to get this in that opening?. I told him my McGuyver can do anything and he walked out shaking his head. After arriving at the park, we did some measuring. The unit was larger than our opening so Dutch gently and carefully enlarged the sides and the top to bottom opening. One side was easy as there was a cabinet on that side so he had "meat" to dig into. The top to bottom was ok too as we had plenty of wood. He enlarged the other side and fortunately was able to keep the integrity of the wood, albeit not by much. He removed some of the padding from the back as it was a bit longer than our old one too and he cut a vent hole. Fortunately, we found a cover that was pretty darned close to our paint job.
It has worked well for us for years and I hope it continues as it is a real bugger for the 2 of us to pull out and put back in as ours too sits above the stove vent hood.
Let us know how you make out. Hugs, Di