Ok, so I have only been able to find the drawings for my last car which had both a factory fitted basic alarm and aloso an after market Moss alarm system. I built a special interface unit myself so that using the remote Alarm Keyfob of the Moss alarm system, it would lock the doors, turn on the Ford alarm, and turn on the Moss alarm.
I don't think that you will have a factory fitted ford alarm and so things will be more simple.
If the colours of your wires going to the drivers door lock are the same you will be able to work it out.
From the Ford central locking control unit there are 3 wires going to the locking motor. The common wire is Red/Yellow. The close wire is Yellow/Brown. The Open wire is White/Brown.
The alarm system that you are fitting needs to be able to pulse a relay (lock) for about 4 seconds when it is turned on. It also seeds to pulse a diffrent relay (open) when it is turned off.
I will post the pictures and then you can ask questions.