Scopa!! firstly let me say, brilliant post. Photos are clear and sweetly labelled.
The what's this is your starter solenoid of which is mine playing dicky at moment. Only stops working when I've had a long, hard shift and don't feel like kicking it over
To answer you question....
scopa:can I attach the breaklight wires to any of those wires I have access too?
Yes, you could, provided you've got the right ones. (oh der!!!! he says...)
Iwas about to do mine and was just going to go in through the actual tailight assembly until I found that I had to take off the side panels to get to the wires anyway.
Those tabs you pointed out will pop out with a bit of forcing. If you look closely at the photo 6th down and see the inside of the "seam" if you apply a little pressure on the outside panels it will help the tabs pop out. Don't go tyrannosaurus on it just firm pressure. You should be able to see how the tabs are pointed and could even pop your finger down and help lever them off their little panel "locks" (for the want of a better term)
Where abouts are you?
look at clean your engine bay is????? Dang!!!