Divide and develop plots themselves

No, I consider the project unfeasible.

Yes, those are all valid objections. The whole range of complaints about children screaming from Rottweiler can also happen to me in any other random neighborhood; to what extent being "nice" to neighbors in such cases actually helps or not probably depends.

How to organize the whole thing privately, especially once larger amounts have to be paid in advance, is an important issue. I didn’t want to address that if the project was already considered 100% impossible.

The region is "stupid," I know, but on the other hand, any other way of living here is also unpleasant, so that can encourage willingness to compromise.

My – very naive – idea is this: If as such an interest group you become the project sponsor and someone drops out, then at least you have control over whom you choose as neighbors in a secondary instance as the remaining group. Of course, that means you are in direct competition with "real" project sponsors, but maybe a landowner finds those unsympathetic and won’t sell on principle? From everything you can read here about small-scale land purchases, sales decisions are clearly much more than the question of whether X€ > Y€.

Everyone involved is aware that the project does not correspond to the "standard" in any dimension, but why not think big first instead of giving up right at the beginning. :)

Yes. The biggest difficulty here is likely finding the right person who is at the same time citizen-friendly, influential, and professionally competent.

This is easier than one might think if you proceed strategically, can think in terms of benefits, and are familiar with conducting conversations. Attend building committees for information and the overall situation, find out which topics are important to the community, bundle some of these with your interests into a common vector, and contact the mayor to win him over for you.

The question is also which village, which municipality wants to bring an enclave into the area that may be completely self-sufficient or pursues interests that can prevail against locals.

The question is also which village, which municipality would want to bring an enclave into its territory that is possibly completely self-sufficient or pursues interests that prevail against the locals.

This question does not arise. It is not about any municipality, but about a very specific one.

Oh, I just remembered: Under the search term (links are not desired!?) 6-Seen-Wedau you will find about 90 ha of project land in the Ddorf catchment area, maybe a small project plot will be available for you.

Thank you very much for the kind offer, I will write an email during the day.

Gladly, that worked out great.

Where we – for me – would come to the problem of distinguishing a wasteland (of sufficient size) from the exterior area within the interior area.

I didn’t mean anything "complicated", for example I know a project where a little club of young retirees built a handful of bungalows on the campus of an abandoned folding box "factory" – that was a typical "non-disturbing trade" on the edge of a village-like §34 district. Take a look at La Compostella Neuwied, they founded a GbR for that.

The entire range of objections of children’s screaming from Rottweiler can also happen to me in any other, random neighborhood;

I understood it as meaning that no Rottweiler belonging to an external neighbor was meant, but one of a fellow activist couple.