Here are some sketches of what I have in mind with the next set.
There will be a 4x2" building at normal height and a higher 4x3" version. Both will have the clay wall and the wood fill textures, but I envision them more with the wood panel look. To support this look, this time the fill panels go all the way up.
The smaller house you can modify by cutting out a part, as depicted in the little sketch in the top with the "X". This element can be wrapped around the bigger house as shown in the two sketches on the top right.
Finally I want to make a water mill wheel module that you can put on a wall to turn the building into a water mill!
So again I am aiming for many combinations. You could mix these buildings with the ones from the first set for more variety or you would just take these houses with maybe the lean-to from before and create a mountain village or a fortress (... and now I might need to make a 'fortress walls set' later down the road).
I'll start building some prototypes to see how this all works out on the table!