I did something similar about 5 years ago. I bought a old used single wide trailer, 3 BR 2 bath, we gutted it into a 2 bedroom, with a build out kitchen from an old deck I tore out. We put in a full bath with a shower and a large living room. We installed a wood stove for heat. I run it with a 4000 kw Generator, as well as a battery 12 V system for early morning, when we just run lights, getting ready for hunting. I have 2- 20 gallon propane bombs that run heat, and kitchen, and a15 gallon Hot water heater I removed from an old RV. I have a 500 gallon water tank with a 3/4 hp pump that runs the entire trailer. We installed agraveless septic system out of an old fiberglass water tank.
Believe me we started this thing with a dream and a prayer. But over the years we have kept on adding and adding, until we have a place our families enjoy coming to.
I would have never done this without a long term deal.
We built 2 tripod wenched cleaning stations, so when 2 or more deer come into camp, you dont have to wait on the other cleaning pole.
We built a covered cooking area, with a redneck outdoor kitchen for BBQing and cooking fish etc...
Those are just some of the things I have done. Hope you can steal an idea or two.