My first attempt at a ratrod was confinscated by my 10 year old. It is the 24 inch Monark Rocket. I now have 2 more choices an old Schwinn Balloner that I really like or a spaceliner. What do I try next?
I think that Schwinn is the perfect "Rat" base. Throw some nice wheels with color on it, maybe a ridable seat and grips, and maybe a new chain? Overhaul all the bearing parts... Sand that patina to smooth and hit it with some flat clear and you're done!
I really like that Monark. Your son has good taste!