This ship, the Goliath, has the purpose of carrying a Scorpène class submarine as its cargo. The Goliath can operate on the surface or submerged. It’s made in a catamaran style with a slightly elongated Scorpène hull as the bulk of each hull. On the front of each hull is welded the partial bow of a frigate (a Taiwanese Cheng Kung class frigate, but that may not be important) . The stern of each hull is a custom bay that holds weapons and magazine rounds over and above the stern of the submarine. The shafts are extended to place the propellers beyond interference of these bays.
The centerpiece between the catamaran hulls is a bed upon which the cargo Scorpène lays. Twenty-six welded supports, thirteen per side, hold the bed to each hull. There are also twenty-six hydraulic presses which hold the Scorpène in place when it is being carried. The presses are withdrawn toward the catamaran hulls when there is no cargo, as shown in the top view. The telescoping sections of the presses are mounted centerline atop each submarine hull, where a high-pressure line is run to each press to drive its movement.
A crawlspace between the hulls is built around the mid-line welded support. The after-most welded support holds the rudder and stern planes. The weapons bays in the aft sections have semi-circular hatches that flip outboard to expose the weapons and sensors when the ship is not submerged. The domes in the front of each hull are the bridges.
Not drawn - 4 torpedo tubes on each hull. I didn't specify where. Forward or aft will work. I'm leaving that to artistic license. There are no torpedo reloads, meaning no need for a torpedo room or handing equipment behind the tubes.
I also didn't draw the weapons in either bay, but I'll give extra consideration for an artist who does. On the port side will be a rail gun (i.e. think in terms of BAE-systems) and a 3-face planar array radar. On the starboard side will be another rail gun and a laser point defense system. There's a lot of artistic license on these weapons as they are still new in reality.