Plot - Ideas and suggestions on orientation and development plan

Could it be that you are mixing several descriptions?

It seems to me that you are the one who is quite confused: a minimum roof pitch is only required here in case dormers are to be installed on the roofs; single-family and multi-family houses do not contradict each other, and for the latter only one and a half parking spaces per unit are required instead of two as for single-family houses.

It seems to me that you’re the one who’s confused: a minimum roof pitch is only required here in case dormers are to be added to the roofs; also, single-family and multi-family houses do not contradict each other, and for the latter only one and a half parking spaces per residential unit are required instead of two as for single-family houses.

Look here:

The development plan specifies a building with 2 full floors and a gable roof with a pitch of 30-40°.

And here:

permissible roof types: only gable roof, slope 30 - 40°

But here then this, yes with dormers, but it reads as if lower slopes are also allowed, then without dormers:

Roof dormers / other roof structures (dormers, cross gables, returns) are permitted on roofs with at least 30° pitch,

You can build a relatively large house on the property

as narrow and wide as possible

Contradictio in adiecto. Preferably narrow or preferably wide?

I hope I have considered all necessary details.

And now you want a finished draft? The development plan allows a lot, and you give the forum too much freedom. It is common for the builder to visualize their ideas and present them to the forum so that proper criticism can be made and improvement suggestions can be given. Here are parts of your text translated pictorially:
[ATTACH alt="Lageplan.png" type="full"]52853[/ATTACH]

In addition, we want to do without a full 2nd upper floor

Why?

“gibt vor” and “maximal zulässig” contradict each other

Now you are being very picky. "Maximal" is correct.

But here then this, yes with dormers, but it reads as if lower is also permitted, then without dormers:

In the development plan there are different areas where other roof shapes and pitches are also permitted. The first details relate to the building plot, the later details to the entire development plan. For the building plot a gable roof with a minimum roof pitch of 30° applies, so dormers are allowed here.

You have to ensure that the house entrance is accessible from both streets, otherwise either visitors or the delivery person will have a problem.