I’ve seen a lot of flatpack and pre-fabricated house plans, but the MADI house from Italian architect Renato Vidal is one of the best I’ve seen. It can be set up a couple of days and ships all over the world. The timeless A-frame design comes with a second floor and kitchen standard and starts around $30k for the smaller size. You can even get it energy independent with the addition of solar panels. It can be customized in a million ways and comes in a handful of sizes to fit your budget.