From what we have seen at TV it is hard to build a hot air balloon, you must use sometimes helium because is much easier than air, etc.
But you can easily build a hot air balloon using the thinnest bags you can get sticked together with some duck tape.
Your homemade balloon will be solar powered and it is going to fly for a long distance because the sun heats the air inside and makes it lighter.
DO NOT launch these near an airport or military base because you can scare to death the pilots or even produce an incident.
You can write something on your balloon like BIOHAZARD, TOXIC, DANGER and for sure you will scare your neighbours.
Maybe some reported UFOs were homemade balloons like this one…
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