Building the SB home around the container would provide quite a heavily insulated building.

Just outside of town near me, there’s a barn that utilizes 52′ containers as part of the walls/storage.
I’ll try and get a picture for ideas. There’s another along the highway, but it’s too hard to get a pic of that one.
But think of the old horse barns where the horse stalls were on the sides on the long dimension.
The containers are located there.

The other one, has two containers stacked as the side walls along both long walls/sides.