Russel,
If you change your mind and want some top notch goodies for you 915, the guys at the link below can fix you UP! They have an Aussie contact as well.
Windrush Evolutions. If nothing else, check out their stuff just to see what they have. It's not cheap, but it's quality.
A buddy of mine, an Aussie expatriot, had a DRB (he is a boyhood friend of Denis') with a 915 in it. He is now building the Li'l Big Rig, which is a kit to turn a full size Chevy or Dodge pickup into a miniature semi. I am not sure how busy he is, but I can tell you that, if he has time, he'll be happy to help you. His name is Bob Williams and here is his website:
Li'l Big Rig
Regards,
Lynn