This is fascinating to watch--thank you for posting the updates. I see that you have the key levers masked for painting. What sort of paint do you use?
I used a spray rust reformer coating by Rustoleum. https://www.rustoleum.com/product-catalog/consumer-brands/stops-rust/rust-reformer/ I have used this product before and it work very well to repaint the keylevers. It forms a rustproof coating that is quite durable. The frame and the paper table and a few other parts will get bead blasted and painted with a gloss lacquer.
