Kassoumay was designed by its first owner who wanted to maintain maximum performance in a comfortable family layout. The cockpit is separated by two large sliding doors that open the salon to the cockpit, forming a large walk-in space.

The layout was originally that of a standard charter – with four cabins accessible from the bridge deck, each with its own toilet. This configuration was adapted on Kassoumay and a forward toilet was removed and replaced by a small washing machine. (A spare Jabsco toilet is on board in case the washing machine is removed)

The forward peaks are very large watertight compartments, behind crash boxes, (which in the charter version of the Lagoon 47 are often converted into crew berths). They are accessed through a large Goiot deck hatch. These compartments can be used to store sails, spare ropes, fenders, sheets, empty fuel containers, mooring buoys, harpoon guns, etc…

Starboard hull
The forward cabin has a double berth and a small seat with plenty of shelving inside and, on the outside, a small molded-in storage cabinet. There is good storage space under the bunk, including a large center drawer. Two portholes and a large deck panel provide very good ventilation. These hatches are equipped with screens.

The center passageway has compartmentalized shelves at the headboard, with two heavy-duty ocean-going fishing rods and reels (Shimano and Penn) on racks below. Inside is a large toilet (Jabsco manual toilet) and a walk-in shower. There is a large molded shower stall with a hot/cold pressure shower, teak grate and sump pump.

Steps down lead to the kitchen and living room.
A black water tank has been installed in the starboard aft cabin. It has not yet been used.

The master cabin has a double berth with a large storage area underneath and a long shelf inside. There is a small double shelf on the outside for drinks and small items. Two reading lights and two ceiling lights, as well as an AC outlet are available.

There are two portholes with a view of the sea and screens on the outside. There is a large deep drawer under the bunk, hanging closets and shelves next to a molded desk/secretary.
The bathroom is equipped with a handheld shower and a toilet with mirror. The Jabsco toilet pod is manual, but an electric adapter is available for installation. The shower area is made of white molded polyester, with hot/cold water under pressure.

Port Hull
Two portholes and a large deck hatch provide light and ventilation. They are equipped with mosquito nets.
The central passageway inside is equipped with a shower compartment for guests, a top-loading 2.2 kg Lemair washing machine. There are shelves at the headboard, and a space to hang clothes, for example clothes for heavy weather.
The rear cabin has a double berth, a large drawer and ample storage space underneath. The SSB Icom tuner is located above the bunk and two reading lights are located on the rear bulkhead. There is a closet with shelves e. A 220V outlet and a 220V outlet are located on the shelf under the secretary.