Hello Ball
thank you for you E-Mail.
That we understand each other correctly:
You can build the house till up to the roof construction for the tile ( see pic)
That means:
1st and second Floor without any walls and the roof construction ready to but on the tile (because we have to chose them before)
What we know is the tile will be CPAC Monier around 1 tile 4 kg - one or 2 colors but this we will choose when we are there.