Notes:
The assemble phase puts all of the pieces together. The sketch developed in the design phase becomes the master plan. There are a number of tools that can perform this operation. Some of your choices may be limited by the output format capabilities of the modeling tool that was used.
Spazz3D is the VRML modeling and integration product from Spazz3D (http://www.spazz3d.com/).
Internet Scene Assembler is the X3D scene creation package from Parallel Graphics (http://www.parallelGraphics.com/).