It sounds like quite an intense but rewarding project! Working with dry screed and OSB boards definitely seems like a practical choice, especially for maintaining the natural indoor climate of an old building. The meticulous process you described, from preparing the subfloor to ensuring everything is aligned and soundproofed, shows a great balance between function and care for the home environment. And who knows, maybe that floor will even inspire a dance or two! How long did it take to complete the project?