I too am considering such a trip. I'll likely put together a desired itinerary and then enlist a TA that specializes in RTWs for suggestions/booking.
That said, remind me. What are the UA PQP earning restrictions on *A flights? (I know the preferred partner vs. other *A in terms of miles/something.). But is the PQP limit per segment or per ticket?
Just asking to ensure I maintain UA status.
Thanks.