The Hoover class was a 23rd century Federation starship in service during the 2250s. Two ships of this class, including the USS Edison NCC1683, fought in the "Battle at the Binary Stars" of 2256.
According the designer of the ship (John Eaves), the ship class was named after the US Air Force Pilot Bob Hoover.
 The premise for all my deck calculations: a deck is 2,5m + 0,5m for EPS cables, power cables, ... = 3m height for a deck.
 My calculations follow a purely mathematical approach. I do not compare bridge modules or disk heights with each other. I always pull in decks based on the rows of windows and then calculate a physically plausible room height.
This is the side view of the Hoover class:

schematic by Starship Collection 
With a height of 3,0m per deck, the Hoover class has a total length of
430,25m.
If you use the official size of 356.3m, the ship would have a deck height of only 2.48m (including 0,5m for EPS cables,...). Just by the number of rows of windows in this class of ships, there are
30 decks. Considering this amount, the official size of the ship would be much too small.