proportions of a megayacht

hi everyone,

we are still designing on our megayacht - university project...

so now i have a question about proportions of a mega yacht.

ours is supposed to be about 90m long, 12-15m wide and we wanted to have 5 decks above water level and 2 below... now with a height of 3.5 m per deck (including steel construction) we would be at 22.5 m... that looks extremely high.

would you say that those proportions still sound right? are decks only 3m maybe or should we just get rid of one deck in order to make the yacht look a little mor sporty.