As a youth of the 70's and in the days before mental health and safety became 'normal' I had a thing for building my own 'custom bike from stuff (not necessarily bike bits) laying around. The best was chrome dress rails sawn in half and hammered flat at one end with a cut out for the axle. Remove forks, hammer them straight and jam unflattened end on newly straight ish fork. Drill hole through both for nut and bolt and hey presto a proper chopper! Crap to ride, and inclines were out of the question but I could see my bike in the school bike shed at hundred yards and thought I looked the bees knees. I seem to remember rigging up a brake light thing as we with a giant square battery gaffer taped under the saddle. Happy days.