www.youtube.com/watch?v=xDtqUg8R6Jw

Looks like a balloon. Its almost impossible to build such aircraft in just 230 grams without using balloon like body.

Yes, I thought it was a helium filled one.
Watch in HD,
at 2:38 we can see the seam...

Pretty Skilled builder and flyer...

Can anyone find its build log?

Check this build log for Boeing 777 http://www.rcgroups.com/forums/showthread.php?t=1878621.  You will love it and will get lot of tips.

I've seen that before...
Anyway thanks..

It is built of fiberglass though...

As per my understanding the entire airplane is made up of thin depron its a custom built with lot of work to get the round curvy fuselage not easy though  plus many test flights.. but the builder I dont think he has shared the build details any were on the forum

This is what  I found on the net but this is a boeing 747 build thread with a  54.5' span hope this helps

http://www.modelflying.co.uk/forums/postings.asp?th=28017