Here is one idea that solved several practical issues on my Commander: stairs to the interior; a seat for my new nav station; and storage for my hatch boards. I came up with a fairly simple plan that solves all of these issues. I made a box with a removable top to store my hatch boards. The box slides into guides screwed into the front face of the setees and doubles as the top step and a seat for me when I am at the nav station. The lower step drops into wooden brackets screwed into the setees and is easily removable. The box and lower step slide out so I can access the engine compartment. It works great and was pretty easy to make.

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The box and step in place with hatch boards stowed

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Hatch boards stowed

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The box removed for access to engine compartment behind stairs. Note storage for cup holders built into the nav station.