I made one for 7 bows, figuring that is nearly twice as many as I would ever own. So much for prior planning.
Things I'll change when I make my new one:
Make it for 8 bows in case I ever by another
The peg spacing actually works fairly well since the pegs are long enough to let a strung bow hang down in front of athe bow behind it.
I'll make the cabinet at the bottom a bit deeper and the vertical sides a bit wider. This will let me hang my uninstalled limbs for my RER LXR on the sides of the vertical pieces.
I was criticized for building a "gun rack" because it supported the bows too far outside of the riser. With a modern glass bow I can't imagine that making any difference, but who knows - I might someday buy/build a self bow, so the new one will support the bows closer to the grip.