For the next build I was just looking around on amazon...it wouldn't be able to house plants in the background but I found an Exo-terra rock background (18x18) if I cut that in half then one piece in half again I could do the back and sides above a false bottom. And still leave enough space to pot some plants in the substrate. Wondering if it's worth it to save time and money. Idk how much it would cost yet fr the great stuff band acrylic paint and titebond etc. But the background is $11!