Dear Client.
For your basement renovation, I keep the walls, windows, doors and railings as they are.
The main idea is the use of suggestive boundaries, so the transition between spaces is direct, it gives you freedom and relaxation.
For the transition between the ground floor and the basement, I advise you to use a strong connecting element such as a modern chandelier with many elements suspended from the ground floor slab to the basement, it gives you a visual connection very leases.
I recommend that you save the location of the pool table for proper operation.
For the dark part of the basement, it is recommended to use it as a projection room for watching movies or playing video games.
The essential part is where you express yourself, so I recommend a common activity to strengthen family ties, such as drawing and crafts.
I hope you will enjoy with my ideas. PS. I upload a video of this project in this link. Hope you enjoy with it.
YouTube Link:
https://youtu.be/t6J8FFJKtTo
best regards