I'd be very hesitant to build anything that would impede your access to "the basement." That's a large and useful storage area down there, and is a great place for heavy items not used every day, such as recovery gear, tools, perhaps a second battery, etc.
While I fully understand the intent behind storage drawers and have lived aboard boats for years (where storage is at an incredible premium), I've become a fan of thoughtfully-chosen plastic storage totes and boxes. If I were going to build anything back there it would likely be a rack system to allow such storage boxes to slide in and out in a stacked configuration.
Will be following your project with interest!
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