OK cool, I have 3 stacking boxes, so two will have a normal sliding top and one will have a double top/table
At least one of the lids will be a cutting board.
The basis is pretty straight forward. Two wooden struts, held in place by small magnets and a small lip for the two cut-outs in each end.
Then an L-profile (I am thinking stainless for strength) screwed onto the struts leaving room enough for another L-profile attached to the lid to slide in.
I haven't quite worked out how the L-profile is attached to the lid, but I think the wooden trim covers it. Else I will have to make some sort of slit/groove. Will find out as I go along.
Hardest part so far is to make (six) identical struts because of the rounded corner (did I mention I am by no means a pro wood worker
). Shouldn't make a lot of functional difference if they are not perfect but I think it is in keeping with the Snow Peak spirit to at least strive for perfection