Many, including myself, have gone through the romantic idea of containers. Some like the altruistic reuse, some like the edgy look. If you call enough architects and people actually active in using containers, there is one remark that you will hear repeatedly: "You're not going to save any money."
That being said, you CAN save money IF you do fabrication systematically and do multiples. That concept is also universal.
Here are a few hurdles to containers:
1. Insulation. This is a metal box. There are some reflective coatings that can be applied that work well BUT do they suit any local codes. Codes may not be an issue if using as portable... You are putting humans in these.
2. Arsenic. The containers are treated to repel bugs and critters, and not rot. Some funky stuff can be in the wood floor that you may want to leave exposed.
3. Codes. IBC codes have few, if any, specs for these. Local engineers like "commonly used" building materials and systems. Permitting these in construction projects is becoming easier...but not as easy as stick built.
Here is a plus if you can get a piece of land suitable:
1. Taxes. These are portable. If you don't permanently attach them to the real property you MAY get by with not adding to your real estate property tax. If you are in a state that taxes personal property this may not be a big savings.
2. Agritourism. This may be a stretch for you, but all of this on a farm can be part of a trendy place to stay.
At the end of the day, the sun will rise and set on IF local authorities want you to do this. Even if it is permissible, fight them at your own peril.