Except that I already put a question mark behind the cost reduction achievable in this way: be glad if it works, but always calculate without family discounts.
Being able to do it yourself factually and being able to do it yourself scheduled into the construction progress are two different things.
Of course, we definitely factor in the risk that my father, ourselves, or other helpers from our circle of friends and family— for whatever reasons— might drop out, and also that we might not manage the timing. But I know from experience that it is possible and can also bring significant financial benefits if you don’t have two left hands and manpower in the family, not only from the construction of my parents' house in the mid-90s (architect-designed house 200m² with basement— planning, excavation, foundation slab, floor slabs and roof trusses outsourced, everything else done in-house, construction time 1 year, costs about 500,000 DM), but also from various construction sites in the extended family circle, some of which I helped out on myself.
Maybe it hasn’t come out clearly enough yet: the plots found on the Deep Market are often even "cheaper" than the offers seen online.
I already understood that, thanks also for your clarifications in this regard; your contribution to this thread is insightful and valuable to me. What I’m still missing is a tangible and feasible strategy for us to reach the goal in the foreseeable future. For access to the "Deep Market," extreme networking is apparently necessary to earn the trust of those willing to sell. For that, it’s already required that people find you likeable, which few can influence without conscious deception. The difficulty level here in Ostwestphalia is also considerably higher than elsewhere — the type of people here are especially distant and reserved, friendships often only arise after years of acquaintance, and the fact that both of us are introverted tops it off — of course, if you really want something, you can come out of your comfort zone, but that is psychological hard labor that only a few extroverts can comprehend. Corona also contributes to the lack of opportunities for networking. Then there is the chicken-and-egg problem: how to integrate into village life if you don’t yet live in the desired location? Then the time component: it doesn’t help us to do five years of hardest networking work just to get a plot for a bargain price if that bargain price in five years is higher than today’s moon price. Prices are expected to rise further as the supply remains scarce but demand increases. Then we would also have less time for financing until retirement and would either have to accept a higher monthly burden through higher repayments or take the risk of having to keep repaying from the pension, the amount and existence of which my generation doesn’t even know yet. Did I already mention that I have a moral problem with befriending people only because you want something from them? I guess the people concerned would have a problem with it too if they found out that I only hang out with them to get access to a plot. So it remains only word-of-mouth through colleagues, friends, and acquaintances, and postings at the village shop for me. If that doesn’t lead to the goal and there are no further ideas, then the dream of self-building is probably over before it even began, or we have to calculate the construction much more tightly because a large part of the budget will go for the plot alone.