ᐅ Concrete house construction company in the Bamberger area with experience in Lignotren

Hello everyone,
We recently purchased a building plot in a newly developed residential area near Bamberg. According to the development plan, there are strict building regulations. For example, the single-family house must have a flat roof and be built on three levels (ground floor, upper floor, and recessed top floor) within a building footprint of 9 x 9.5 meters (30 x 31 feet), meaning we have little to no flexibility regarding the exterior appearance of the house. However, that’s not a problem.

Now, the focus is more on finding a construction company. We are undecided about the building method and will definitely request several quotes (timber frame or solid construction). However, we have the impression that there are thousands of prefab home providers, but we could hardly find any solid house builders online (at the moment, we only know Probau Massiv and Dennert).

So our question is: does anyone here know of construction companies specializing in solid houses, preferably regional and with good references, operating in (Upper) Franconia?
And has anyone had experience with the Klimaholzhaus building system from Lignotrend and could share their insights?

Thanks in advance and best regards
Davidoff