Mr. Sai (RCforall) had very kindly donated a large number of paper gliders, built on the same mirror fold technique, to the Assam Valley School in September 2011. Not only were they beautifully printed on stock paper, they had an iron nail which could be slid in and out of the nose to alter the flight characteristics. It was truly an international class product and the little kids LOVED them.

Whow,
But, I have made much better than that. And some more realistic too.
Just Use 60 or less GSM Paper.
And make paper spiral on nose to make weight.
It will glide much better.
Just made some paper cuts.
All flights nicely. And the prop revolves while gliding too.
Please don't lough, they are made quickly with excercise book pages (50 GSM perhaps).

Thanks
Just try it.