Snake,
Seems like there should be a "How to cut the openings" book. If you cut on the line for the Bear Claw striker, before lining up the striker then, yes...it could be off by that much. "ALL: the scribe lines are just a guide and are NOT to be take religously!
The trick here is to line up the door first, then install the striker to the door, then cut out for the Bear Claw, then fit the brace for the Claw to the car.
As far as the "twisted door".... not likely, but possible of course. This is where you get BOTH doors lined up to the "front edges" first. I'd bet that the back of the body is off to either side a little.
In other words it may appear the left door rear edge is out a little on one side, in on the other. Simply stand in the middle of the car, facing to the rear, grab the rear cowling edge and pull / push to the side where the door is sticking out. This is where and when you want to drill and mount the rear deck.
On the brake switch, I made an assumption that you are using the CR's pedals? If so the brake pedal has a large stud coming off the right side. The process for installing the switch: Slide the brake pedal push rod on the shaft first...JUST flush with the outside edge of the stud. Now take the switch, with the slotted side inboard, toward the left with the slot facing up. Sandwhich the pedal with the switch, with the slot in the switch fitting up on the stud, now push the pedal and the switch all the way to the left.
Install a large washer or the stud and install a cotter key.
Your switch is now on. Simply rotate it if necessary to point toward the driver, hook the two wires up and you now have a full functioning brake light switch!
Could have put a dozen switches on in the time it takes me to type this!
Hope it helps!
DV -- We are soooo close! Register, buy your raffle tickets, and be ready to rumble! We are going to set Central Ohio on its ear!