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Take the 4x8 cm extrusions and 4x4 extrusions and make a box.
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Take a FreeCAD image snapshot here and throughout.
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Start by taking the 4080 extrusions - the short sides - and mounting the corner brackets to them.
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Take a corner bracket. Use the corner bracket with the ridge in the middle.
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Put in 4 spring nuts. Note that these may be inserted from the top of the rail, not necessarily from the side. Use 4 of these per corner bracket.
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Detail of spring nut. it has a sprung ball on the back side.
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