People hear "build your own home" and they have a hundred buts. These posts handle them one at a time. No theory. Just what we learned, what it costs, and why it works.
Yes, it is slow. That is exactly why it is cheap. A end grain floor made from reclaimed timber costs a fraction of engineered hardwood and outlasts it by decades. The catch: you cut the blocks yourself.
Rockwool has a reputation. It is also the only insulation that is fireproof, hydrophobic, and breathable all at once. Blown-in installation means no cutting, no gaps, and a wall that actually performs to its R-value.
You do not need it. Concentrating all plumbing in a single wall drops your material cost, eliminates leak risk across 80% of the floor plan, and makes repairs trivial. Here is how it works in practice.
A properly vented composting toilet smells less than a flush toilet. The air is sucked downward through the seat, creating negative pressure. The bathroom smells better after you use it than before.