Question about turning a twin bed into a daybed/storage?

I am trying to get a tiny home built so of course every bit of space is precious. I saw an area made using kitchen cabinets at each end of a twin size mattress and the area in the middle had a board the mattress sat on and under that a storage area. That was a wonderful idea until I did some measuring, I need something that can go at either end of the bed that can be used for storage but perhaps is taller and skinny, anyone have any ideas and the most important part, something that even someone that is very challenged when it comes to building things can do. Thank you in advance for any help you can give
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