These car showrooms are a practical example of how a shipping container module can be used. I have also worked with a company in the UK previously that use the outer steel frames you see here that form an open sided shell that slot walls drop into. This is probably based on the same technology but still using the shipping container size and weights for transportation. A small 7.5 ton truck with attached crane can move these and deliver one at a time. Making it not only cost affective for construction but also transportation.