Thanks Louise, I'm still leaning towards the grey. At the moment I'm thinking Dulux flooded gum for the walls and dulux monument for the roof with white gutters and trims. Still not sure about going white for garage & entrance doors or paint them in the monument.

If you want the standing seam look in the fielders range it is nailstrip in 265 or 465mm wide profile but you will need ply behind the sheeting. If you want a wide profile with no ply use revolution roofing maxline 340

Assuming they are top mounted, and seriously heavy doors at 3.6m high and probably 10mm glass (at least). I'd be doing a check-in with your engineer & draftsperson and builder. Seriously heavy top-mounted door, will need seriously big steel beam to attach to! I wonder if the original manufacturer can convert them to bottom mount, so they slide on tracks? A door this size would sell for at least $10k new. If you can get it for a great price, then spend a little adjusting it for your purposes, it might be well worth it.

Apart from the Barestone cladding and the sub-floor brickwork, what are your choices for guttering and downspouts? What is style of house-I'm thinking modern.?? Single floor, double-storey, or other? All of the external materials need to be considered in order to achieve a cohesive style. You want them to work well together. You may want merely to blend, recede into its environment, or you may want to make a dramatic statement. It would help to know style of house and what other materials & specific colours you have already selected or are presently considering. Answers to these questions will help with further comment. Cheers.