Earthboat is a sustainable mobile cabin made entirely with Cross Laminated Timber (CLT) designed to be a holiday villa around the land of Japan. The house accommodates up to 4 people in the beautiful rural area where the guests can enjoy its surroundings with the sauna embedded in the cabin. One of Earthboat's standout features is its foundation-free design, enabling it to "float" like a boat above the ground. This innovative approach allows the cabin to be placed anywhere in nature without causing damage to the environment. Throughout the project's development, we collaborated closely with CLT factory technicians to incorporate feedback from each unit into the design process, enhancing both manufacturability and efficiency. Currently, approximately 60 units have been completed or are in progress across six locations nationwide in Japan, with an ambitious goal of producing 200 units annually in the future. While small CLTarchitecture, this large-scale initiative significantly promotes the use of CLT as a building material and fosters the advancement of related technologies.