Another recommendation: Just book some dummy dates for your last segments. Date changes are free, so it does not really matter if you leave it open and then add dates or if you change dates.
An electronic ticket is so much easier, no delivery issues. Also when you need to change the ticket (and use a good TA - which i always do, well worth the extra cost) an email to your TA is all you need (instead of going to the ticket office, hoping you find an agent who has seen an RTW before....).
I have a great TA in Germany, he can get RTWs from points like NRT, ICN etc.