You could certainly talk to a cabinet maker and have something custom made to your preferences and design style. You could also talk to a closet design specialist who might be able to utilize every square inch of that space more effectively while working with a cabinet maker. Part of how the space is designed will depend on the age of your girls. If they are under 12 or so it shouldn't be too difficult. If they are teenagers, talk to them and find out what kind of space they need.

A houzz contributor, not too long ago, had made a wine rack out of 4'x4' wooden pallets, that are used in the US to move a load of goods with a fork-lift truck. Perhaps they have them in your country. He cut them in half so they were only two feet deep and stacked them up to high counter height. The wood would be a nice contrast with your concrete, might add a little warmth to the space. cascio.offsite@gmail.com

You could do a nice wood cabinet with a cloth insert instead of a panel. Just talk to a local cabinet maker it shouldn't be too expensive as long as you don't go crazy with design.

You should be able to get everything that you want ........ Are you going to have a cabinet maker build it for you ? I suggest that you work with them and have them draw it up for you........Most cabinet makers are very good at working with their clients to get them what they want.