Hi Ross. Some food for thought… if I were to build another one, I might make the peg blocks thicker (front to back), maybe 1” or 1 1/4” instead of 3/4”, to give the back two tiers a bit more capacity. I’d also cut some longer pegs for the front tier (I’ll do this the next time I roll out my saw) for the same reason.
Mike, you won’t regret adding some cleats if you can free up some space. They make it so convenient to add little custom holders.