Hi, after spending a few hours researching through all the posts i think i have finally come up with a route. Can you please tell me if this is allowed? I think this is right!

So for a AONE5


LHR-YYZ-DEN-LAX-LAS-MIA-MBJ-MIA-HNL-SYD-ALK-HKG-NRT-TPE-ICN-HKG-BKK-SIN-HKG-JNB-LHR

Stop-overs are in bold and buying 1 extra seg in N.america

1) Is that allowed?
2) Is MIA-MBJ-MIA are correct route - i used a link on another website and it kept erroring it.
3) Can anyone see a way to improve this route?

Thanks alot in advance.