Virtual Reality technology performs very important role to design and construct desired buildings and houses. In this paper, we introduce an extended virtual Japanese traditional crafting system to collaborate by many users such as end consumers, craftsmen, coordinator and salesperson each other. Multiple CAVE systems in different locations are interconnected to organize a collaborative virtual reality environment over Japan Gigabit Network (JGN II) which is a testbed network in Japan with several ten Gigabit/sec. A larger number of traditional Japanese fittings in several local cities are redesigned into CAD data and stored in 3D database systems over JGN II. Users can share the virtual space interactively collaborate, retrieve from the distributed MDBs to realize the desired interior space in the house for consumers. We implemented a 3D presentation system by CavernSoft In addition to OpenGL and IRIS Performer in CAVE environment on JGN II and built a prototype system.