Ye Dave im using moulds for the containers, I had to make a container at the right size for ship and then make a mould,(with a bit of help from the GURUS at GRMBC) and reproduce a few times. on my boat there is 400 doors, 400 backs, 100 tops and 80 sides to mould and then mount them on a ready made box, the worst part is getting them all the same thickness so they sit nice on the box.
I did most of the moulding on a two week trip at work so its just a case of sanding and sticking.
You could buy containers but the cost would be off the chart.
Now the uprights, on a container ship the containers come right to the ships side but there is space under the container for walking under so one edge of the container sits on a frame/upright on the ships side and the other edge sits on the hatch.