Can you bludge a shipping container ? ,
Or TWO - putem 20 foot apart , parrallel .
Put a wire rope or beam F & R ,
Throw over a truckers tarp & down at the rear ( fence ) .
Put in a brick barbeque ,Crosss Flows best .
a few chairs & a table . Incude a fridge .
A shade tree or two , and your home .

p.s. you throw in a door or two and a few windows . Bit like this , but wider between and roof slopes aft .

Id use twice as many blocks , so it dont get saggy .
Of course , youll have to do some gardening .

Demo windows & things are sometimes free , in the more affluent areas .

Just a thought .