My mate has an A600 and I did consider asking him. Glad I didn't now !

Spoken to AmigaManiac who is very helpful and can point in the right direction. Have one of his ATX adaptor cables on order Luckily I am breaking a PC and the PSU will be spare so I intend to use this. Luckily it's a silent PSU which is good news Just need to think of a way to bolt it down on to something.