Have not finished it yet. I'm working on multiple major project vehicles at the same time, plus I work slow. So it will still be a while before this gets done.
But I can say the UT gear fits the 1500 engine directly and is fairly simple to do. The only real changes that should be done (in my opinion) is some upgrading of the FI system (on US models). The stock (US) 1500 injection won't support a turbo. But you are in Europe so your 1500 is likely a carb engine? In that case you can use the entire UT injection system (also fits directly) without modifications if desired. Here those parts are difficult to get so I'm retaining the basic US injection. That requires changing to a aftermarket ECU, therefore more involwever if your Euro spec X has the higher compression Euro head/pistons, then it may be too much (too high CR) and cause detonation. In which case lower compression, turbo type pistons may be needed.