Looks like you'd still need a fair bit of structural steel to support that citycenterlofts building. I would say the engineering skill needed is fairly non-trivial, although straightforward -> i.e. not a low-cost DIY type of structure.

I'd be interested in seeing the construction costs of that though, as compared to a similar design not based on shipping containers.

I forgot about zerocabin - I had seen that site before. Thanks for the reminder.