Not sure, you might have cellulose rather then fiberglass...
Anyway, after having fiddled with that type of stove I found that the cat (Supercat) is easier to make and works better for me.
Another easy one is the Tea Light stove, slow but very economical. Works well if you have the right windscreen. Today I tested my version ( I use part of an above stove filter, thin aluminum mesh, instead of the fiberglass) with the Caldera Cone. 1/2 oz, 14 min to boil 500ml and three to five minute boil after that . You can make your cone as well
The Supercat is twice as fast but uses about twice as much fuel.
Cone at
http://www.kolumbus.fi/antti.lusila/models/laskekartio.html
See Zen Stoves for Tea Light and Cat stove and search for the Supercat.
Franco