I believe he mentions that he has been on the island for 5 years, atleast several times. So not exactly a short period, and he hasn't had a whole lot to do. And he erected the tree house the same way people worked before mechanized lifting equipment was invented. He probably used a series of pulleys and levers to hoist lumber. We already know he uses pulleys for his elevator system and many of his traps. Plus, we know he is well schooled and inventive, with a large amount of resources at his disposal. While I agree it is probably a bit more than one would need in real life, it is possible to an incredibly industrious person.
And it is an incredibly beautiful house and I would love to live there, although it didn't look like it would fare particularly well in severe tropical storms. But, none the less, great for the imagination!
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