Battery isn´t installed yet. That plastic thing would be only cover to avoid electric shortcuts, but maybe I change that when I´m doing it.
Someone asked about those Wilwood calipers earlier, but I ordered from here: http://www.rallydesign.co.uk/product_info.php?products_id=11370
I can´t recommend before I have driven my car, mut it feels that mechanical handbrake got enought power for parking brake. (maximum vehicle weight 750Kg) is mentioned, but I don´t know what is REAL problem when caliper is made from basic 4-spot Wilwood Powerlite, and hydraulic braking power is enought.
With those disc width 0.35-0.50" or 0.79-0.86", it is not a real "racing car" caliper for sure.
I´m sure those can be fitted to 15" wheels. My current setup is 278x10 mm rear disc. Caliper adapter is my own design.