In a parallel universe I'd probably ask myself what I set out to accomplish when starting this tank and had I accomplished it. I would also ask could I learn any more by pursuing this for another six to twelve months.
If the answer to the fist question was yes and the second answer no then I'd probably rescape it.
Personally I could never tear this tank down, it would be my masterpiece. You on the other hand are fully aware that another stunning scape could be remade in a matter of months. Suppose its a bit like Van Gogh painting over a painting, he knew full well the next painting would be better.