Thanks Guys,
I was in the Java Sea last November with Kevin D we had some good diving. He Was wearing ear muffs last time I saw him on deco, with a watherproof MP3 player. Pretty up to date for an old bloke!
Yes we talked extensivly (even argued a bit) - Looks like something in the 60lb - 80 range is the go. I have found some Dive rites Superwings here in Sydney aparent at the right price (aren't they Guy

)
Currently I have set the unit up with my old (10+ years) Zeagle with no back plate. A bit of a bastardisation but it is working. Reasonably well.
Principally looking at the back plate to hold the breather then the harness to hold everything else. I dont want to overload the case being fibreglass. A torch and stuff like that OK but not heavy cylinders.
Will keep you all posted. Thanks for all the input.
Steve