ᐅ Flat roof construction with a self-supporting railing or similar structure

Hello everyone,
who has experience or knowledge about the "construction" or use of a flat roof? Specifically, it concerns using a flat roof for occasional access, such as a rooftop garden, etc. The main point is this: one part of the roof (not on the outer edges!) should be secured with a railing.

There is the possibility of using industrial-type inspection railings which are free-standing due to their own weight and additional load (gravel, slabs). Would this be feasible on a private house? Has anyone done this before? Has anyone installed something similar without penetrating the roof membrane?
(Structural stability, etc., is not an issue.) The building regulations of North Rhine-Westphalia (NRW) do not specifically address this.

2) Access to the flat roof can be achieved in various ways. A preferred option is an internal stairway combined with a roof hatch with a glass dome that opens and closes electrically. Has anyone installed something like this or found a different solution?

Any experiences or insights are welcome, thank you!

Is mounting to the parapet not possible?

Thank you,.... it is possible, but not desired. Therefore, a partial roof as a "roof garden, etc."... The rest will be covered with gravel, but only the area around the exit will be secured.
Best regards!

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Bocatoo schrieb:

This concerns the following in particular: a part of the roof (not on the external surfaces!

Please clarify! It’s not understandable like this.

For example, see the picture. Here, there is access via a dormer/attic storey, but it is relevant to the topic.