I really am starting to like the low height tanks more and more. I also like the longer tanks but I am asking myself about the "depth", from front to back and which would be more aesthetically pleasing to the eye, a narrow yet long tank like the 12g 36"x8"x9" or one like you have built. You certainly have much more depth than a narrow tank. I like the look of a carpeted tank and it seems you will have a lot more choices with the large footprint. The tank looks great and I cant wait to see how it turns out after scaping it.
55 gallon, 48" T5 HO, SunSun HW303A and Emperor 400 filtration