I like those tank dimensions! And the window too - so glad you’re reusing it. We’re DIYers and for sure would have taken that wall down in 3 seconds - I’d love a fish room. The one thing is, personally I like to see as much of the tank as possible, so I think I would like to have it stick out on all 3 sides. But then of course you have to have the stand on the other side as well...hmm...
Anyway, looks great!
Gee, I just used my old rock, sand to start things off
