I did just what your talking about when i raised my ceiling for a lift. The garage door guy used some of the existing rails & some new ones. He had to install bigger springs because the door doesn't start turning until the door gets higher.
Matt Murphy
(he "ADT Guy" is probably a licensee of ADT working for I SCREW SUBSCRIBERS a division of U Ben Skrewed. He is also full of **** unless every zone in your current system is used.)
Even if every zone is used, you could add the garage to one of the existing zones.
DD,
You & Your Family are making a great sacurfice for our country!! Let the members here help out. It's the holiday season & it makes not only the receiver feel good but also the giver! If something is setup I'M IN!!
Looks like your Dad spent some fun times out there, I'm going thru the same thing right now w/ Dad. He lives in the city & would have loved to have a shop like that for his hobbies.