That's right Jonno I don't feel I could make one I would be happy with at the moment.

But I must stress this is only my opinion and I am not trying to influence anyone in an adverse way.

I think I am A victim of my own training ,we were told never mess around with compressed gas, always use the correct fittings never modify or use a gas handling component outside of the manufactures instructions, and so on and I just can't shake that!

With the fire risk question I would agree this dose cause problems with regard to Insurance and public safety. These are questions that have to be addressed in a legal way, rather than from an engineering point of view.