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.
The box and step in place with hatch boards stowed
Hatch boards stowed
The box removed for access to engine compartment behind stairs. Note storage for cup holders built into the nav station.