Newbie needing advice

I am getting into woodworking. I have an irregular shape in my bonus room that I would like to have some sort of storage. Mainly books but also a little area to mount my mobile ham radio and my small scanner. Contemplated bookshelf flush with the size of the opening as well as cabinets on the bottom. I am a newbie but am learning more each day.
You can see a rough picture in the first few pictures here: }65
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