Coming in at 199 feet, everything a single person would need...
Thinking something like this would be very quick and easy to build. I'm thinking that an under-counter fridge (next to the stove) and an under-counter washer/dryer (next to the shower) would leave tons of counter space, which is one of my must-haves for food prep and preserving.
For HVAC, a mini-split should work nicely. Not sure about hot water though... is there an all-season option for mounting a tankless heater on the outside of the building or perhaps something that can be installed under the sink?
For the bed, I'm thinking a super-single on a loft frame, with a sofa or desk under it. A sleeping loft might be a possibility but I'm thinking that a usable loft would make the building too tall.