[Aussie Mike]

Stiffy, I thought about the heat and fading issues but the need for good lighting overrode that. I'm not having any external windows for security reasons and I didn't want the place the be dim and dark. I went for a tinted sheeting so hopefully that will cut down on some of the heat and UV.

I spoke to a couple of insulation suppliers and they reckon it's OK to use batts with a colorbond shed as long as you have a layer of foil between the batt and the steel. That shields them from the condensation.

Cheers