You want to use your Carrera Digital 143 with 4 to 6 cars and all other features from Digital 132/124 then converting a CU is the first step!
I broke up the adapter into 3 parts as it was too big to fit on my build plate. One screw did not go in at the end as there is a slight offset but it was good enough to use it and I did not spend any further time. If that's an issue for you, please go ahead and improve it (and give me a shout).
Basic Instructions:
The author hasn't provided the model origin yet.