Your house looks great man!
The technique isn´t that simple, but it will be easier with some experience. Cut bigger pieces of clay, and roll them flat with a round woodstick. While pressing the clay on the tape keep your fingers wet. And I now have a kind of foamcard called "KAPPA fix" which already has tape on both sides.
By the way: In my experience the best things in life are not easy to get, but cheap
