The kit is a custom tele kit.
The only routing on the front is for two humbuckers and the neck with a cavity in the back for the wiring. The scale length is 648.

Currently if the pickup is in the bridge and sitting in the pocket the measurement to the bridge is 656mm

Not trying to get it even for a pick guard as it doesn't have one just trying to get the bridge in the correct position and see what I need to do to get the pick up to fit into the pocket.

Ill try tomorrow to do as you have suggested and move the adjustment out further and see where it is at.

I have already made a routing template for the pickup pocket so it will be easy to adjust the pocket if necessary. The good thing is I suppose that if it does need enlarging that the bridge will cover the enlarged pocket and you'll never tell.