Hoppy's design is a good idea and will work great.
However I want to emphasize how VERY critical that plywood back is, in the top right image.
This piece of plywood is exactly where you will get 90% of the racking strength (what will keep the stand from flopping sideways and falling apart if it's bumped hard, with lots of water weight on it).
Follow Hoppy's design, especially on the 3/4" thickness for the plywood. Decent plywood around my area is $50 a sheet at Lowes. I can find it cheaper (and better quality) at cabinet shop suppliers and lumber wholesalers, but the average person will do just fine with Lowes stuff.
FWIW you can actually build a very cool looking stand buy purchasing the decorative bricks, stacking them right, and putting a slab of plywood across the top. I've seen several that were done quite nicely.
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