In my proposal 7 -8 people can sleep in the ‘bunk room’.
Below is a short explanation of how I created a new space.
I wanted to keep the room open and light so that there was certainly no locked-up feeling. For this reason I have placed the beds as much as possible against the walls. In this way a smooth passage is possible everywhere, also to the bathroom.
Between the wall and the door of the bathroom there is just enough space for a single bunk bed. Since the space is long enough we can put a second bed with a wardrobe above the bed. It’s not possible to place another bunkbed otherwise a small part would pass by the window. Now the single bed just fits under the window.
Against the other wall we can place a double bunk bed by removing the cabinet.
Since the space is long enough there is still enough space to place a new custom wardrobe.
If you count, there is room for 7 people but sometimes there are bunk beds for 3 people on top of each other. For the time being I have drawn a bunk bed for 2 people next to the bathroom because this is more standard. But if you find the right store, this can certainly be a solution for sleeping with 8!
I also made some 3D images to give you a spatial insight.
I used a marine style because you are located near the sea but the space can certainly be decorated in another way. If you want some inspiration you can surf to www.pinterest.com.