Not sure why you want to have so many segments on one ticket... Sure it's more convenient to check the price and buy. However, it's usually more expensive than buying separately. Also, if you want to skip a segment on your trip, you may risk of losing all the remaining segments...
If you don't mind buying separate tickets but want to get an idea of the total price quickly, you could try
https://www.vamo.com/flyertalk as it supports multiple destinations much better than regular OTA. You could customize a trip and get a price quickly.
It was mentioned in the forum before:
http://www.flyertalk.com/forum/trave...arch-tool.html