Yes, there are guitars manufactured from a single huge piece of wood.... but they are rare, almost always custom jobs, and very expensive as a result of such a huge piece of wood being hard to find and the build process being totally thrown out of whack by the limitations of working with a single piece of wood, especially one that starts off that big.
I´ve seen exactly one guitar made of one piece so far in my life, hard maple. It sounded like crap, but played well and looked stunning. But for 3,5k... no thanks