These are the colour scheme you can go with ,Highlight the staircase with dark colour with muted mild colour background.Muted colours will bring down the boldness of the projections and merge down its presence.

I agree too! I personally love chalkboards as they add a fun element to the space. Also a quick tip- Use a soft cloth dipped in a mixture of warm water some vinegar to clean a really messy chalkboard!

you can go for suspended lights from ceiling in slant direction below staircase with tv module below it. the light module will be triangle in shape in elevation which will create straight profile for the unit. re Regards, ANSHUL AGRAWAL studio aakriti

You can also think on panel work with some openable shutters which can hide the boards as well give an access to use when needed . Bottom can be a sleek storage with louvers where inverter can get tucked in and also a seat or a ledge used for multipurpose. One thing to remember this set out would not be budgeted but, can allow you to explore option to make it look good or articulate well.