Homemade hanging bookshelf made from Walnut and Red Oak

Same here! I usually adamantly avoid Red Oak, but this came out much nicer than I expected.

I was planning on using cherry for the shelves, but the store was down to only twisted cherry boards that I didn't want to deal with, and it was Friday afternoon going into Labor Day weekend so the weekend would have been a loss if I waited for cherry to be back in stock. Surfaced Red Oak was only about $7/bf (half of what most of the common hardwoods were going for), so I figured I'd give it a shot and if I hated it then I could always swap the shelves out for something I liked more.

Also thanks for the compliment. And your son has good taste in Lego sets.

The boards were nominally 4/4 surfaced to 3/4".

I did 12" center of board to center of board for each of the squares. In hindsight I would have liked them to be slightly taller to fit bottles a little better and be a little better lit (I think the Sticotti Bookshelf probably uses 14" on center if not larger). But 12" works well particularly on an 8' tall wall with this configuration.

And you didn't ask but I found 5/32" worked well for the depth of the dado cuts on either side of the verticals to cantilever the shelves. That leaves 14/32" (slightly more than half) in the verticals where the dados are.

And cross cut sleds with a quick jig to make the spacing between notches was clutch for keeping spacing consistent.