recomend you do not release it with in the flight path of your local air port coz this baby goes realy high.
and in the right conditions wont come down till the sun is down as once the fuel has gone the sun seems to heat the black plastic enuff to keep it up.
Step 1: Bits n peaces u need
cut the bottom from one befor compleatly unfolding for straitest cut and tape them together with light packing tape to create the envolope of ballon.
with strips of balsa wood make a large capital letter I shape to fit tightly in mouth of envolope, use pins to hold in place while you adjust for tight fit, remove and glue.
should be an aproxamate sqaure.
put a long needle threw middel of balsa frame with alumium foilglued in place to prevent fire .
couple bits of tape at each corner is enuff to hold envolope in place.