In at least one place you mention Cat-6 cabling, but elsewhere Cat-5. It might just be a typo, but Cat-6 everywhere would be better.
Electrical connections in the shower are going to be problematic over time. Moisture and heat accelerate corrosion of connections. Just saying... They shouldn't be dangerous, so long as they're low-voltage and current limited, but you'll doubtless need some kind of safety inspection to certify that they meet local electrical code.
You seem to tend to have "from" and "to" reversed. e.g. HDMI should be labelled as going from receiver to TV so it matches the signal flow. Otherwise people get easily confused. e.g. in the Garage you have an HDMI going "from TV" but don't say where it's going.
Putting a sub in-wall won't necessarily produce the best sound. Because of the interaction between low frequencies and room dimensions often people have to find the best location for a subwoofer by trial-and-error. In a corner isn't necessarily the best, either. Putting one in a separate cabinet is likely to be problematic, too.
I hope these comments help a little.
Marantz SR7009/7.1.4/FH+TM/DefTech PM1000/LCR+TM amped