No i figured if the rest of the wiring was this nasty, the work behind the HU must be perfect so why look?
Nah just kidding, i fixed it all! Thankfully they must have not had a small drill bit because the hole the in the firewall was big enough to not slice the power wire, and to let it lots of water!
PO57 - The battery was so generic it had almost no markings on it at all, but was sealed with no vents or caps on it. Otherwise i would have required it to come out for good. I'd rather have swapped it for a smaller Stinger but since we were on somewhat of a budget, some things had to wait. I attached it down and made a cover for it so it's well protected.

And yes, for sure this work was all paid for by a shop. No drunken buddies here, just pro hacks. I do know he purchased the Autotek amp and the kicker subs at the same shop that did the work. I would be very interested to hear what someone who owns a shop putting out that work would have to say about it. Work like this makes ALL of us who work at or own real shops look bad. If i took my car somewhere and paid money for work and got this, I'd question ever paying for work again.