Just a bit of a warning with regards to these gas bottles, not the safety but the pong....
Gas has almost no smell, so for safety in case of leaks the manufacturers add a strong smell to the gas. I have just been cutting the openings in bottle inside my workshop/garage. The smell gets ever where and really lingers. One it gets in your nose it sticks for many hours. The only way to get rid of it from the bottle, is to burn it out. Do the cutting outside, at least to the point where you can light a fire inside to burn it out. Don't leave the opened bottle indoors, at least until the smell has been burned out.