Here is the model thus far. The tunnel mouth takes about 22oz. of resin to pour & is sollid resin. The walls took 6 seperate RTV molds not to mention the seperate mold to build my own windows. I will soon upload new pics showing the exterior of the tunnel, rear venting towers along with the rear of the main portal. Some of my features are a tad off but it should still look impresive when done.