That's neat, the tiny bit I have seen of construction plan drawings looks like greek to me! lol I give you a thumbs up to be able to do that kind of thing on a day to day basis :)
The only kind of "play music" I have done is the flute and that was for about 5 years. Its mandatory to learn an instrument if you take a music class in high school here in Ontario.
I have always enjoyed singing and dancing more. I was in choir for most of school and took a few different types of dance classes. I still sing almost everyday. I don't usually sing in front of a crowd or people I'm not comfortable with. I have a serious case of stage fright! :S But I enjoy music a lot, it helps me express whatever mood I happen to be in at the moment :)