Thank you for this great project, I have attached the design that I made, you can see it in real in the render that I made.
On the exterior of the building, I tried to make the walls have a stone texture with the addition of white paint, there is a floor with cement tiles in the open garage, besides that there is a pergola that leads directly to the river.
in the interior there is one large bedroom, and one small bedroom. besides that there is a bathroom, and toilet, as well as a fairly large living room with a fireplace, and a medium-sized kitchen, there are many plants in the interior so that the impression of a growing house that you want can be realized properly.
hopefully the design that I submit is according to your wishes, thank you. best regards