I've got a new seat thanks to the generosity of a forum member who sent me one.
The wheels are cleaned, lubed and rolling smooth and true. The rear derailleur is a smooth piece of machinery. The only thing left to do is break the chain off the bike and clean the front derailleur and the chain thoroughly. Then it will be time for a test ride.
The only problem is that there is nothing but rain showing on the forcast for the next two weeks!