Yes, it is designed with openings only to accommodate the mechanicals. The area where the heater and the filstar output is a wall that the inhabitants could easily pass through. Behind that is a space in the background so that the heater and output will be suction cupped to the glass as normal. I am hoping having those two in the same area will prevent my concern about the heat not being circulated appropriately. The HOB
is accommodated by having that area carved way back so the part that hangs over the lip will just do so normally. It's the only equipment that will really be visible but I don't think that little hangover will bother me. Its intake is behind a little wall set at an angle that's open at the bottom and one side, so I don't think that will present a problem for the critters. All the rest of the decorations will be firmly siliconed in with gaps and edges sealed. I will upload a couple more pix. In the final design you can see the hideout I have constructed for the ghost knife I will be getting. I'm going to position that right at the front of the tank so when it is in there it can be easily viewed. I am really excited about the idea of having all of the rocks and caves and things look uniform, as though it all came from the same place. I have cement color in black and tan. I haven't decided exactly how I will color it. I'll do some color
experimenting with cement coat 2, so I can either duplicate it or change it when I do the final coat.