If my car would be equipped with working airbags, I would disconnect the battery before removing any of them - just because - but otherwise I don't bother. I've done major soldering jobs, like climate control installation, leaving the battery connected, car has been welded several times with battery connected, without any problems, apart from a couple of blown cigarette lighter fuses several years ago caused by bare lighter socket shorting to ground. As for the new cars, the same principles should apply, of course, the electronics now are more complex, so turning ignition on with something half disassembled might cause fault code for some device, but this is not your case, as you left everything related to airbags in place.
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