I Googled "dundjinni bridge" for you and got some results for you:

http://www.dundjinni.com/forums/foru...0269&KW=bridge

http://www.dundjinni.com/forums/foru...s.asp?TID=1244

Here's a blog that talks about making a rope-and-plank bridge: http://newbiedm.com/2009/11/17/newbi...emap-part-iii/

Doesn't go into much detail, though.