What a really nice build. So many little touches you've put into this, like having the canister filter on a wheel-out shelf. Brilliant.
A thought about stocking: With a tank that narrow, you'll want small fish, which you said you were planning on. But it seems like you'll also want to be sure to include some top and bottom feeders, so there is movement and color through the whole thing. It will be beautiful when it's done!