This one child of mine can play with legos for hours on end. I wish I had that same dedication to craft and determination. He is working on mastery of all things transportation. He can make camper vans, long haul tractor trailers, speed boats, cruise liners, and in this situation a PanaMex or maybe even a New PanaMex sized shipping vessel complete with containers and escape pods, a la Captain Phillips.
It is creative work or play and it makes me happy to see him engaged and allowing his mind to wonder and create.