I think you are asking to do a sunshade. First Amano is a trade name and its Called ZN/AL roofing sheets.Normally market sells in 0.35,0.4 and 0.47mm in thickness. Also it comes as HITEN AND LOWTEN as per the properties of the base material.
You can have various colour range from company to company.there are man roofing sheet profiles as normal, tile like. What your attached pic is a tile profile roofing sheet.
Distance between purlins for normal roofing sheet for 0.47 is maximum of 1.5m it depend on the thickness of the sheet as well as the HI TEN and Low ten. For tiles it should lay between two tiles and normally it as 600mm but change from company to company.
If you fix these to a nor normal steel structure then need to use self driven roofing fasteners normally as 55mm length but for wooden structure it is 65mm wooden fasteners.
Gutter should fixed before the roofing sheets and can fix by internal of external brackets.
I think this is what you need to know. Put some pics then I can tell you more abt the roof
Remember there are so many cheaters in the market even in popular companies too . As they sell sheets only to the price.To reduce the price option is to use low ten sheets for roofing, low thickness (As 0.35 instead of 0.40, or 0.42 instead of 0.47). Also they say the thickness of the sheets including the paint thickness. There are 4 layers of the sheet including the base materials. It says as Japan and south korean sheets are ok but same as all due to the cost most use chineese or indian sheets.
What will happened is fading the colour and correction.
