Low Structural Cost - High Strength.
Shipping containers offers a huge structural strength
for a fraction of the cost of traditional house constructions.
Because all the strength is contained in the structural elements
themselves, the foundation design is simpler and less expensive,
most likely all you need are concrete post under the container
corners.
Containers are an extremely flexible method of
construction, being both modular in shape, extremely strong
structurally and readily available for a low cost.