I just recently built a 125g viv and I tore apart my 40g for various reasons. Now it is time for reconstruction. The tank is just two 20g longs stacked on one another. Each one has a crack, but they were mended before the previous build w/o any issues, so I am not concerned about them what so ever. They are circled in red.
The eggcrate that I have one the side is going to be for the powerhead, which will cycle the water feature. I am always a sucker for water features, so any chance I can get I will add one.
I have some driftwood, cork bark, stones, and other supplies that I will post shortly, but for now this is what I'm working with.