beagle_senior
just be careful doing the wiring yourself and not completing it.
Most tuners prefer to start from scratch with a wiring loom rather then sorting out someone elses mess they couldn't finish.
Yeah this is very true!
If you choose to do some of the wiring yourself, you should write down exactly what you have done and what you haven't done, so whoever finishes it will have no doubts or confusion.
BTW, I think the Adaptronic SW20 plug-in ECU is for the gen 2 turbo engine (you may want to confirm by emailing them). If you do end up going with Adaptronic, you could either use the plug-in ECU and re-pin your ECU plug to match the gen 2 turbo pinout, or you could use the e420d or e440d Universal Select ECU and wire it up manually (I would happily help you if you went down that route).