Most of those possible features don't take up enough volume to justify lifting a huge portion of the ship away from the rest.
Based on the stick figures on the ground nearby, the ship is 4 or 5 decks high. Five would mean those stick figures are over 2m tall, while four makes them a bit short. The difference can be split, since the measurement is to the bottom of the slope. Making the bottom catamaran arrangement a little more than one deck deep puts the stick figures in the right height range.
At four decks total, keeping its presented proportions, and assuming the catamaran arrangement to keep this thing from being a huge flat-bottomed office building, the volume is between 800 and 900 dtons. Going flat-bottomed brings it up to around 1000 dtons but makes the overall shape less interesting.
Keeping something like the original proportions while bumping it up to 5 total decks would nearly double the displacement. It would, IMHO, make some of the original proportions attenuated unless we hid it all under the skirts, which the depicted landing gear do not support, or split features across decks, which is inelegant and wastes the potential of the picture.
An increase to six standard decks, essentially ignoring the stick figures for scale, pushes the ship to well over 2000 dtons.