Is this a concrete carport? Or wood/aluminum?

You are probably right. I am sitting at the CAD and also "drawing" diligently right now. Can you tell me how high/wide your purlins are at the wingspan? And then also the crossbeams? How did you build the roof? With an Alvitra or a pond liner?

I can tell you the height/width later, I would have to measure it, I can only tell you: SOLID.

The roof was first covered with a special "foil" (I can't recall the name right now), then 3 layers of bitumen, then the roof edge profile as in the attachment...

Dimensions are no longer quite correct like this...

Yes, the big car is probably actually longer than in the drawing, which visually "bothers" me a little. Because of that, it looks as if, since the car is too long, one theoretically couldn't close the nonexistent gate at all. With a (sectional) gate, I would find such a "recess" elegantly solved as a "canopy."

Thank you but no, we just gave it some thought, and let's be honest, if you don't record it exactly, in the end it means "Oh, that's not how we understood it"

Have you ever thought about measuring the bars?

Have you ever thought about measuring the beams?

Good morning Unfortunately, I haven't gotten around to it yet. However, this morning before leaving for work, I took two or three pictures. I estimate the longitudinal beams to be about 25 cm high and roughly 10-12 cm thick. The beam that bears the main load also seems to be about 25-30 cm high and 10-15 cm wide.

ok, that's a start