I guess that building one is only half the fun.I am a professionaly trained Chamber tech with hundreds of hours operating and repairing deco chambers.
I have just one thing to add. Even professional training is not enough. I have seen other professionals screw up and nearly kill people.
I've seen routine surface deco turn into emergency table treatment because someone got tired.
I've seen a profesional diver take an O2 hit and start coughing up blood.
Proper use of a Chamber is a team effort.