OK WoW! You cut a LOT of shit up!!!
I'll write down what I remember from AIM.
Since you don't have a key any longer to open the trunk, and the mechanical cable is cut, fold the back seat down and lock onto the lid cable with a pair of vice grips. (If it's impossible to get to, take the rear seats out, it's not too difficult) Use that to open/close the trunk until you can get to a mechanic, or you get a weekend off to try it yourself.
You
*definitely* want to buy a new trunk cable at a Toyota dealer. Might be expensive, but you said it yourself.
You don't have the time to go playing around junkyards.
The wiring... Eventually one way or another, you're going to have to solder the old->new wires together (
use heat shrink to seal and protect the joint, not duct tape, or electrical tape) For now, since you're short on time, go a head and try to splice them together with nuts. Just don't over tighten, or damage the wiring because you're going to be close on the length of the wires.
You don't want to have to re splice them later on only to find out that they're an inch short, and you can't make it up!!!