I LOVE IT!!!
Especially if it would take some of those $*%$&$*# trucks off the roads.
I'd imagine they put a panel on the ground first, park the containers in a row on top of it, then position the fuselage above, lower it, and connect the bottom panel to the fuselage even though there's no mention of a bottom panel in the text or image. They didn't mention the means of attachment/capture for those containers at all.
Too bad, those containers have got to be fracking heavy, way heavier built than a purpose-built aviation container. What might be perfect are containers built like some of the latest over-the-road tractor trailers: a conventional sturdy floor and I think roof too with canvas sides. I'd think the key for these would be loads palletized such that there is near zero chance of them tipping over en-route.