Re: Stipping old windows of paint and putty
You will find a few schools of thought on those windows. Many will say toss em and get new ones, others will say refinish and reglaze.
The steamers can be found through a web search, or just use a garment or wallpaper steamer. Enough google work and you can locate the episode where they stripped wood with steamers and they will likely discuss the paint disposal.
If you have a local historical society or preservation districts they may have some references, I know here in Houston they just had a workshop with a presenter discussing just what you want to do.
One thing to remember, while you like the look of the wavy glass(and I do too), it is wavy because it is inferior. The manufacturing methods just were not as good, and that is why it is wavy. The glass will not be as efficient as a new pane of glass.
It's this old house, not this built after your dad was born house.