If you go true golden mean dimensions, a 4-5 foot hive will have bars that are too long, and combs that are on the big side. I wanted to do the same thing when I started, but ended up blowing off
golden mean dimensions as they related to length. So my present hives have 18" bars, and that seems to be perfect. Each comb of honey is around 6 or 7 lbs.
Adam