I thought the studs were on 24" centers.
Why would you need to "tear the wall out"?
I would attach it to the studs. If you can't attach the mount directly to the studs I would attach something (plywood ?) to the studs using self drilling screws and attach the mount to that. Four screws should do it and if you ever have to move it you only have four holes to patch.
You would want to span two studs but a 42" set should more than cover the area.
Attaching to metal studs is not as easy as attaching to a 2x4. The metal studs only give you about an inch of surface as compared to about 1 5/8" of 2 x4. You may find pre-drilling for the screws helpful.
DC
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