This thread is absolutely awesome, so much information from all members, but especially WalnLiz, so thank you.
I only just recently was running an air conditioning branch in WA and worked for the same company in Adelaide for a number of years, so I know a number of sheet metal manufactures and am in the process of getting a quote for a modified box from my mates in SA, but transport may be a killer, unless they can put it on a pallet already coming over here. If freight is a factor, think I'll just knock it up myself.
Anyway, once I get it underway, I'm sure I'll be back on here asking some questions.
By the way, has anyone put up some videos of their build in action out in the field?
Cheers.