that's why the question was meant to be viewed independently. If I already had the carport, I would know the spots and therefore the question whether one can then work with KG pipe. ;)
Additional question: Who uses a carport that was obtained via e*bay, or possibly also bought at the hardware store? Are there any experiences? What should one pay attention to?
They are usually not particularly expensive. Is building the carport first and then paving a solution for you? Then you don’t have to take the stones out again.
You should pay attention to wind load and snow load, which vary depending on the region.
If you build the carport first, it has the disadvantage that you often cannot properly reach all areas afterward, for example with the vibrating plate when there is lateral cladding.
I can see that no matter how you do it, there seems to be no right or wrong.
Another question: Often, roof coverings with steel trapezoidal sheets or trapezoidal sheets with a fleece coating are offered. If I read correctly, then the fleece coating would be better because there is no stalactite cave effect. Opinions on this?
Rainwater would probably just be collected in a rain barrel.
Is a flat roof of a carport usually only sloped to one side (the back) so that the rainwater can drain off, or sloped to the side and to the back so that there is a central lowest point, otherwise gutters would have to be installed on both long sides if the slope goes only to the back, or ...?
Why a gutter? It just splatters down. That works. DIY store carports. Mr. Gardener from Hagebau is quite decent. They have, for example, a model made of larch for 500,-. It is made quite durable. I looked at it last year, when it was still open, and then dismissed it because the car can also stand outside, we bought it painted, not bare metal. We decided to pass on the 500,- after all.