Quote: (Originally Posted by
NAVY_MA)

What do you think?
Is the set up DIR?
Any safety issues?
Is an AL80 my best choice?
Anything I’m missing?
Don’t worry about my feelings

Not ideal but not a complete disaster. I'd prefer a twinset but if I was going somewhere on holiday where I couldn't get one I might do what you are describing.
Not its not DIR, a twinset is much better suited as it has more redudancy options.
The main issue is you are taking more gas but if the stage reg fails you've lost access to it. You also can't share it, if your buddy has an issue - all you can do is hand it over. Out of interest what is your buddy/team doing while you do this? Presumably they will be doing the same? If not how are they managing their gas?
AL80 is probably the best choice in terms of cylinder buoyancy for bottom stages.
Cost is rarely the right reason to make a decision. Personally I'd save and convert it into a twinset. Twin AL80's would be fine in a wetsuit providing weighting is done appropriately. If you've got the regs to do what describe, two AL80's, backplate and harness it sounds like all you need is a manifold and a doubles wing. That sounds like a much better option.
HTH
Al