You will be running in all kinds of limitation with the RTW tickets (number of flights total, number of flights per continent etc).

One possibility would be to split the trip up into two or three RTWs, one OW and one Star and possibly also a Skyteam, find out which airlines are going between what places and then look at it like at a big puzzle.
Try to get the long and/or expensive sectors into the specific RTWs.

Or try to find out where you can buy seperate sectors inexpensively and use the RTW for the intercontinental and otherwise long sectors.

It is fairly inexpensive to buy seperate flights in Australia. www.travel.com.au should be a good staring point for one way tickets.

In Asia use Bangkok or Hong Kong as a starting point for the china flights. www.zuji.com (for HK) or www.bangkoktickets (for BKK) should give you an idea. Domestic flights in India are also typically not too expensive. Use the RTW or a seperate BKK-DEL/BOM-BKK to get there.

Malta you can find as round trips from Germany.

Berlin, Amsterdam and Frankfurt can be done by train.

It takes weeks to figure all that out.

My suggestion: First find out how you can squeeze as many places into the rules of a RTW.
Then try to find out which places you can go to from the stops in the RTW using the local websites (after you got an idea what is available at reasonable cost locally).


Also flights in the South Africa area (Zimbabwe) are easy to find (www.travel.com.za)