WOW nice find and your dad is letting you have it? that is very nice of him if it fits. it should be a great riding bike. why do you want to ruin it and make it a Fixed gear? if you live in a hilly area you may want to cruise around and get used to riding before you go to a set up where you have one gear and can't coast down hill. but that is just my humble opinion
__________________
“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk