Just in case someone is interested, using the same TA recommended by RooFlyer (thank you!) we have finalised a J itin using TK fares: SYD-CGK (with QF) // CGK-IST-OTP (with TK) // OTP-IST (with TK) // IST-YYZ (with TK) // YYZ (YVR) SYD (with AC). The cost pp is around $9K plus $500 for booking done by TA. We are happy with this as we could not have done the booking ourselves! The reason why the fare pp was around $900 higher than the headlined fare in Mattg's article was because there are 2 TK daily flights from CGK to IST - one day and one night. The day one is cheaper, we wanted the more expensive night one.
Since we have not done a RTW before, but booked all our trips point to point, either paid cash or ff points, there have been a number of itin changes to fit in the rules. If we understand the RTW rules then it would have been easier to plan the itin. We gave the TA our QFF numbers for QF flight and SQ KrisFlyer numbers for TK and AC flights. Oveall the TA has done a good job (as I am a control freak!). She asked us about our seat preference and selected them for us - I have checked and they are all OK. Most flight J configs are 1 x 2 x 1, except TK flight IST-YYZ is a B777 so 2 x 3 x 2 reclined seats not flat.
Before the TA emailed us the final itin, I saw the flights she booked came through awardwallet so I knew before receving her email the refs and selected seats. I went into QF, AC and TK websites to view them
This trip is in August for hubby's birthday and we want to visit Costa Rica. We do a stopover in Toronto and take AC flights YYZ-SJO-YYZ. We booked these ourselves. The flights are 5+ hours, and the planes are the narrow body A220, so the Y config is 2 x 3 so should be more comfortable (we hope) than B737 with 3 x 3.
RooFlyer has given us useful tips about the massive IST airport - which we have not been. The TA said we would be getting the 2 nights in a 5* hotel from TK, based on our itin.