hey mate, I believe we've spoken on another forum (http://www.daewootech.com/forum/viewtopic.php?t=10456), sorry for the delay in this responce.
I would love to help you guys with the 1.8 and 1.6 but I'd have to see pics of the motors to know I'm getting the right stuff for you.
I'll post a couple questions on a UK forum and see if they can help to fill in the gaps.
the 2.0 is the same for sure and those parts are available. I can make the pistons for your motor available as well I would just need a sample (say from a scapped motor).
do you have a forum that you use based in Oz? I'd like to join and get some info from there as well.
thank you,
Garrett