Motor mount construction

I'm in the process of converting my hyper 7 to brushless. I have threads about making motor mounts using angle aluminum. Today I bought a nice piece of aluminum from a local scrap dealer. I love places like that, but anyway I have a question about the aluminum.

The angled aluminum is slightly fatter in towards where the angle is and gets thinner towards the outer edge. So when I mount the motor it, the motor will will be mounted at a very very slight angle. More importantly the pinion will be closer to the spur on the motor side. Were talking about a very very small difference but, I guess my questions is that a big deal? Should I even worry about it?