Any Pix? I would suggest you get a factory service manual. This is a high end car, there will be a passel of gadgets, and many harnesses. Have you got a mentor near by who can assist? I recall a police department who got a Vietnam era Huey for a buck. A department, FAA certified mechanic decided he was going to "rewire" the ship. To make a long story short, it cost the county several thousand to have the thing carted away. Before starting this, I would verify what works and what doesn't work. This includes the lights. Granted there is no computer, but just rewiring the rear lights and having them work properly will be an accomplishment. Crimp on connectors are nice, but you must do several hundred successfully before starting this. Purchase only high end components and ratchet style crimpers. To quote Dr Charlie Wang "while it is possible to make a poor connection using good tools, it is impossible to make a good connection using poor ones." Some of the connector locations are going to be difficult, inside door panels, behind the dash board etc. These are the ones that will give you trouble, if not done properly, they can leave you low and wet. (Nothing electrical fails when high and dry. Me) Quite frankly I would pick up a Cavalier or Citation, and try rewiring that for practice.
Keep us informed.