Do you use the flue pipe in the bathroom and kitchen?

The method you said is okay, but you must install the flue check valve, and there will be no sequelae when the flue check valve is installed

Yes, as long as the drainage pipe is moved to the desired position, the pipe is long, and the slope elbow should be used as little or as possible, and the bond will be firm, and there will be no sequelae.

Waterproof first, then the floor drain model, and the location and quality of the hidden pipeline, especially pay attention to the laying of the drainage pipe to be straight, as little as possible to turn.

Your tile is a substandard product, it is recommended to open all the tile packaging, and then carefully pick out the same size of tile, put a tile of the same size together, another of the same size put together. And so on. Then, when tiling, stick tiles of the same size to one wall as much as possible.

Definitely can't be used, it will taste.