Interpretation of Development Plan for Slope Location (for Beginners)

Two questions to the community:

[*]Is the term "dry stone wall" actually defined, or could one simply use rough natural stone blocks with a height of 50cm? The latter is very common here and probably significantly cheaper than a classic natural stone wall.
[*]Is the ridge orientation to be understood schematically, or could the house possibly be rotated slightly? A slight rotation could make a valley-side corner somewhat freer.

I think the potential builders are in shock.

Not just them, me too: the incomprehensibility of the explanations is downright "exemplary." On the one hand, the houses are not supposed to have basements at all, and the unavoidable basement due to the hillside location is simply called "EG" in the schematic drawing; on the other hand, the height specifications for the ground floor apparently refer to the "OG" in the schematic drawing. Why the centerline of the house depth should be relevant for the stepped cascade of slopes remains silent the municipality (or am I just too dumb to read it?). In my opinion, this is a building development plan that requires a leaflet explanation; you could actually raffle off the right to buy the plots among urban planners and surveyors :-(
Furthermore, natural stone walls and alternatively 25° slope angles are mentioned, but not the rules for their combination – should one create rice terraces here? – you could get a PhD in "Dr. Landscape Gardening" from this!
Regarding the fun of reading the development plan, I want to shout to the OP: "welcome to the club !"

Furthermore, natural stone walls and alternatively a 25° slope angle are mentioned, but not the rules for their combination - should rice terraces be created here? - one could practically earn a doctorate in "Dr. Garden and Landscape Construction" from this!

However, I had already wondered about that. What confuses me the most is this: "The terrain must be filled up to at least 40 cm below the finished floor level of the ground floor." If the ground floor is really meant here, what is the point?

I had actually already wondered about that.
But what confuses me the most is this:
"The site must be filled up to at least 40 cm below the finished floor level EG."
If the EG is really meant here, what is the purpose?

We do not understand that at all. The EG has to be "backfilled" anyway. How could it not be filled below the finished floor level EG, the house can hardly stand in the air.

Thank you both very much for the encouraging words. We already thought we were too stupid to build if we couldn’t even understand the development plan, but it is very comforting that it is quite difficult for others as well ;-)

We asked the municipality again about the garage, garage entrance, etc... here too there are similarly cryptic regulations but we’ll spare you those :)