I allready do the Mondeo zetec ecu's silver and black top.
The mondeo engine loom is almost self contained. If you could fit it in the engine bay there would only be one 42 pin plug to wire up and only around half the plug is used. These are good for around 150bhp
The st170 gets more advanced and more complicated. The extra tunning needs extra controle.
On top of the blacktop stuff...
vairable valve timming
returnless fuel pump controler and pressure sensors.
pre and post o2 sensors.
The ecu also hooks into all sorts inclueding the clock
If I can do this then I can do the RS loom.