Make a little mark for where to drill. Check that the bit is level and straight.

Okay, you can do this. It's just a hole through 10 layers of aluminum that can't be screwed up even a little bit.

Bah. To heck with it. Pull the trigger, let's go!

Pull the cabane off, put the bolt through and check for center and level:



(Little "I didn't screw up" dance)

And sigh. The recess in the gusset isn't large enough. A cable has to connect from it to the rear cabane.



Gonna have to trim that gusset back!

The good news:
1) I know how to do this, and it's a straight forward fix.
2) Tool purchase! Hurray! I needed one of those bullet shaped grinder thingies for my drill anyway.



Issue tabled.

Set up the right front cabane for drilling...



And the battery on my drill goes dead. Hmmmm, gotta invest in some backups.