Everything and the bathroom sink

So one day a few weeks ago, I noticed that the pedestal sink in the upstairs bathroom was kind of loose. No problem, right? I'll just get under there and tighten the bolts and move on. Well, the sink was only held by toggle bolts to the drywall, and the head of the screw was impossible to access with a right angle screwdriver.

So what do I do? I tear open the wall to install some "nailers" that will accept lag screws.

 This wall is right against the chimney, but even so, what's up with the 20" on center stud bay? I decided not to block in the big bay for drywall purposes, but I'm sure that I should have. All I wanted was a sink I could lean on! 

Too bad I'm a terrible taper. Also too bad to not have a bathroom sink for a minute....

1love

Andy