I have been CADing the speaker enclosure for the past week now, using NX9 after my previous bad experience with Rhinoceros (see Mockulus Thrift IR). There are 13 total parts, including all external faces and all internal dividers. The design is based on the assumption of using 2 layers of 2 ply stock, for t a width of .1875 inches. Everything is fitting together nicely so far. The empty compartment in the back middle is for the amp, crossovers, and other electronics.