Being able to open is good, but you also have to be able to close tightly.
Yes, that is why I am talking about "a certain initial complication", it would certainly be necessary to install a cover fitted with pivoting flanges (threaded rods mounted on axles and butterfly nuts type "valve") in order to obtain both a good seal and a quick maneuver.
The gas cylinder is certainly a good choice to experiment, but may be limiting for what interests us.
In any case, your editing and its modifications are very ingenious; moreover, your precautions are very judicious, because an ingenious death, it is hardly credible and it would be really a pity!
