Successfully booked the following mini-RTW for this spring, all in J class - recognize TK J isn't highly recommended (esp overnight), and could have added a couple extra Asia hops, but only have 19 days elapsed for this run and I'm happy with the results. (Yes, St Petersburg (RU) is a valid stopover returning from China - does not hit max mileage on this routing.)

YYZ-PEK AC (one week)
PEK-IST TK (overnight stopover in IST)
IST-VIE TK (overnight stopover in VIE)
VIE-LED OS (stopover for one week)
LED-FRA-YYZ LH/AC

Hardest J segment to find was the return via FRA, everything else was pretty open and I had a fair number of options to choose from on dates.

This is my first RTW routing and I must say - after validating through expertflyer that all the segments I wanted were available in J, and then calling AE on the Elite reservation line with the list of segments, the whole call took 10 minutes to ticket with zero time on hold. So far, well done Aeroplan!