Smaller altenator is coming. One swedish 1.2 tdi owner is building altenator to the end of the crankhaft. He took the parts from some motorcycle. He is using the 1.2 in his airplane where weight and space is also a enemy.
Electric water pump is under though at the moment.
its totally possibly to get 3 liter figures with stock TDI or SDI engines in VAG cars, you just need to drive efficiently with them.
Now starting to build the trunk from scratch. Again wont be easy task, but it takes some sweat to get 117 MPG at 62 MPH speed.