DIY cryotrim if possible

Is this something that can be done? Seems like a pretty ez diy project.
So once this tumble trimmer is built then get a large clear tote preferably but I figured any large tote with lid with work. Now put your diy tumble trimmer inside the tote with a crank of some sort on the outside. Not get the proper fittings so CO2 can be injected into the tote. I figured some type of rigid metal threaded fittings w/ thread tape on the same side of the tote as the crank. I found 5lb empty CO2 tanks on Amazon. Only question I have left is where I could get my CO2 tank filled. I need some type if hosed attachment that'll screw into the CO2 tank with a valve on the other end so I can just spray the liquid CO2 inside the tote