Well, I've been doing a little work on the Celica the past few days. I upgraded "The big three" with 4GA wire under the hood and wired the amp on sunday, and mounted and drilled all my holes for my wiring and installed the seat heater switches today. The seat heaters are STILL not wired (who cares though, it's was pretty warm today) but the switches are in.

Here you can see the 4GA wire from the alternator go around the radiator...

...to the battery, and the battery ground to chassis. The alternator bracket/chassis wire is not pictured.
Here are some pics of the amp install:



I also set the gains on the amp using a 1000hz tone to listen for clipping. It's REALLY loud when you do this, and all of my neighbors were probably like "wtf is this kid doing"
I had my roommates drill so I drilled the holes for the seat heater switches:
