very nicely done, however I have a better idea for a brake bolt: get a solid rod that's the same diameter as a regular brake bolt, and cut it so that it fits nicely inbetween the outside walls of both reinforcements, then drill holes on the INSIDE of the reinforcements, stick the brake bolt thing in on one side, and just slide it through the hole with the reinforcement, then stick the other reinforcement on the other side where the brake bolt is sticking out. This way you'd have one less hole to worry about, making it a) even cleaner looking, and b) slightly stronger even.
to help illustrate this I guess here's a rough sketch of what it would kinda look like from the back, and think of all the dashes being one solid rod from one side to the other side of the deck:
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