Here is my completed old-bike-for-an-old-man project. It's an '83 Giant built 25" Schwinn World Sport 12 speed. While some may want to avert their eyes, the bike actually works very well for me. I sit upright with very little weight on my hands and don't need to bend my neck back, which it does not like to do anymore. Aerodynamic it ain't but it's nice to look around at the scenery instead of watching the pavement pass under my front wheel.
Key components are the tall frame, which keeps the seat as low in the seat tube as possible, and a really tall stem, in this case a Sunlite touring stem made of genuine hand welded steel. Because almost all my weight in on my ass, finding a comfy seat is turning out to be difficult. The B72 didn't work for me and this Cloud Nine is better but not quite right. I have a micro adjusting seat post on the way so that I can fine tune the tilt. One trick to making the frame fit right was moving the seat as far back as possible which helps overcome the road bike geometry that is not very suitable for upright riding.
Other not original stuff are the Dia-Compe tourist brake levers, Sunlite alloy North Road bars, Kenda 1-3/8" tires and a Suntour LePree RD that replaced a not original Sunrace fitted with cheesy red jockey wheels.
I really like this bike and always look forward to riding it. It's nice to complete a ride without pain and numb hands, just tired legs.