You could utilize the slanted-roof for passive solar heating. Canadian company NOMAD Homes has produced a new concept micro-home that measures just 100 sq ft sq m), ships as a flat-pack, can operate off-grid, and is said to be easy-to-build.
I want to live here! Charlie's Station, a rental cottage on the south-east tip of Bald Head Island, NC. A quaint old cottage with olde-time charm (no air-conditioning). One of a handfull of old cottages for summer rental I understand.