Really nice job. I got an older KHM to see what a not horribly gummed up Royal feels like for the first time in my life, and they're really smooth and addictive to type on once they're properly cleaned up.

Also I wouldn't worry about the keytops, they're not water tight so the built up grime is the only thing keeping whatever you spill on the thing away from the paper legends. If you do though I'd recommend grabbing a few spare glass tops first. I swapped mine out the less fun and less destructive way by pulling the tabs up with a screwdriver and still managed to break a few, they're incredibly easy to crack.

The older Royals are great looking, but if you got one you'd probably have it as a show piece and end up using the KMM. They feel mostly the same, but the clearcoated laquer paint is both delicate and a fingerprint magnet, and Royal made changes to the line over time to make them longer lasting and nicer to work on.