Thanks for the comments gents.
I haven't decided on a colour scheme yet, although I am tempted by the HML/A-167 cobra snake along the side of the AH-1W (I have the TwoBobs Whiskeys in the Mix decals).
I made the corrugated piping by wrapping bead wire around plastic rod which had been melted in to shape. I then applied superglue over the wiring. First time I've tried it and I think it has turned out to be a reasonable representation of the air hoses from the photos I am using.
I'll post more as I go - but progress will be slow - three kids and a full-time job see to that!
Cheers
Simon