Install loft door after breakthrough

Hello everyone,

I wanted to install the sliding door shown in the picture in my new construction project. I would like to make the opening between the bedroom and Child 1 (see workshop plan). Does anyone have experience with the width of the opening? I was thinking about 2 meters. The wall is 3.70 meters. I am grateful for any tips.

How much does something like this cost? Does anyone have a company or brand for the rail and door? How wide should the passage be? Any other tips are gratefully accepted.

Pictures are attached.

Well, should the door be able to close the opening? Then it would have to be about 205 cm wide for an opening around 200 cm wide. That leaves you 165 cm to slide the door to the right or left, as the wall is only 370 cm wide. The door then overlaps the opening by about 40 cm when the door is basically open. And, the opening would have to be either far right or far left. Or the door is double-leafed.