I want more insights. I'm planning to do one also. I did my homework but the only thing that worries me is fuel. In the place where I live, they don't even know what the heck is SEAT at certain point.
Even saying to turbocharge a 1.8 20V non-turbo lump is not feasible still, due to improper ECU tuning or some sort? Because of this fact, I'm putting off my project idea of doing Turbo/SC.
And no, I can't source a 1.8T engine in my country.