Replace 45x220 with a steel beam?

[justusandersson]

One last point. If the center beam is placed under the ridges without cutting them, the material is utilized much better, but there may not be enough space.

 

[johel572]

Is it possible to open the car doors with a new row of pillars?

 

[oas]

One last point. Placing the center beam under the rafters without cutting them utilizes the material much better, but there might not be enough space.

Yes, that would also significantly reduce the amount of work, but then the ceiling height would suffer and reduce the possibility of parking cars underneath. So it is preferably avoided if possible.

 

[oas]

Is it possible to open the car doors with a new row of pillars?

Yes, there are two additional pillars in the center of the terrace (prepared for a balcony to the upstairs bedroom, but the construction was abandoned by the previous owner). However, there is no beam there. These can support the middle beam.

I realized that I forgot these posts and therefore didn't draw them on the sketch.
Here is an updated model.

 

[oas]

And of course, you can erect two poles where they are missing.