I did read it all, but been restoring and fabricating classic custom award winning vehicles for 30 years, so I don't think some wiring and a cable will be a problem. doubt a retune will be needed, not with these changes, and not necessary as essentially everything will be "stock". just changing the location of the throttle body, wont make much of a difference, engine and ecu wont know the difference, still will get air, spark, compression, fuel, and sensor readings. All will still functions the same as same size and type of components used. additionally I am in the US, so in a few years if someone around here gets experience with tuning these cars properly and or I can obtain the proper software, program, etc. and experience, then maybe someday a tune will be done, simply to optimize potential performance.