Ikea has cabinets Packs system and they are very suitable for such non-standard designs in the interior. I have a Malm cabinet at home, but I put toys in there. For board games I bought a Pahl table and I really like its surface that nothing slides off. Then we specially laid a warm floor and had it installed
https://zelta.ca/blog/how-to-choose-laminate-flooring-for-your-home/ . But I was also planning on putting a built-in table that would fall out of the closet, so I decided to hide it in the door and not do the drawers or side doors that you have (come out of the closet). I like that the floor is not scratchy even though the furniture is not light and the mechanisms have to withstand such loads.