I have to disagree with the prospects of the 1.4T over the 2.0 Optra motor. In the unlikely event the a 1.4 motor could be found in a scrap yard, it won't be a cheap purchase. In addition, the easiest way to get the motor up and running will be to use a stand-alone EMU. Trying to retrofit the standard 1.4 ECU will probably be more trouble than it's worth.

I could be mistaken but I believe the Optra ECU is a direct plug in to the early model Aveos. Aside from the swap the only thing needed should be to modify the 1.6 engine harness to the 2.0 layout.