I bought this '75 honda cb360t for $50.00 that was lying on it's side for
a couple years outside a friends collision shop. It was missing the gas
tank, carbs, and was in pretty rough condition. Ironically, the seat was
in great shape. I sold the seat, directionals, lights, gauges, and a few 
more
items on ebay for $250. I bought a set of carbs on ebay for $80.00 (with
shipping), and after a little work she actually fired up! The last time
it was inspected was in 1986. Once it was running and stopping, (which was
the harder part, seems the front master cylinder was like jello inside, and
the caliper was seized up) I went to work on the rest. After cutting all
the extra unused tabs off the frame, and making a rear fender from the
exsisting frame and some .250" round bar, I decided to make this an off
road survival style motorcycle.  I scored a free gas tank, speedo, and
a few odds and ends from a local bike shop that i help out at, and made
the seat from and old ripped one i had laying around. I then purchased
a set of knobby tires ($100.), off road headlight, and
a utility trailer light for the rear, ($20.00), mufflers, ($20.) and
paint ($10.) bringing the grand total of the build, around $30.
Bike runs great and my yard is getting pretty trashed from them knobbies!
I already dumped it once doing wheelies, I dont think old guys should do 
those.
Here is one before pic (actually once it was stripped down and I found the
gas tank), and two completed pictures.
enjoy

walt