Jeri Ellsworth built some FETs and simple gates
at home -- but she said
it took two years to figure out how to make it work, and she needed some
equipment (like vacuum chambers) that few people have at home. It was
far from simple.
http://trail.motionbased.com/trail/episode/view.do?episodePk.pkValue=8067618
Yes, that is a FET, not bipolar. If you have some links for making
simple bipolar transistors, please supply some. It will make for some
interesting reading.