Workstation with Limited Distractions in a Limited Space - Before

I think my oldest son frequently changes where he prefers to work. This is a problem because he is easily distracted and so we end up having to make accommodations for him wherever he chooses to sit. Of course, I won't let this situation get out of hand and while he does have a desk, I wanted to create a place where he can make things. I feel like he is very creative but sort of a mess. I often worry that I will hamper his creativity in my quest to keep things in order and stress on the clean up.

My son's very awesome doctor suggested that I give him a workshop type space. And I looked at him like he was crazy. We live in a small apartment in a crowded city. The boys sleep in bunk beds even! This was impossible, I said but then I looked at the closet in the boys' room.

The boys do not really wear clothes that need to be hung on a coat hanger so this closet was mainly used for storage so then I started looking at it as a workspace to tinker, doodle, make whatever, and to give him his own space in general away from his nagging mom and the little brother who always gets into his stuff.