you need to buy an ford etis disc off ebay or download it from a torrent.

It has all the wiring diagrams you need.

ABS has its own module so you'll need to stick with one or the other or bin it completely. AFAIK the sensors are different so if you swapped it over youd need matching sensors as well as matching sensor rings on the hubs for it to even stand a chance of working.

You need to sit down with wiring diagrams and list out all the focus and puma subsystems and look them up and tick off what can stay puma and what needs to change. do it systematically and youll be fine.