Stefan and I have been emailing over the final contract of the house. He has agreed to keep the same price from his original quote of 10 months ago, which is appreciated.
I've also decided to stick with a 78mm thickness for the walls of the little house. This makes it a 'summer-only' building, but realistically, we'll only be using it as a guest bedroom in the summer anyways. The walls of this house will be planed smooth; we've decided to leave the big house a bit 'rough' to give it texture and help it fit into the landscape. Otherwise, it might have looked a bit too much like this.
30% of the cost is due upon signing the contract. So we're really committed now!