Glad to see that the first step has gone well. As Colin says, there isn't too much info on that amp around. There's a YouTube video of one being played
here Your amp looks to be in much better condition, externally at least!
Another good YouTube source for vintage amp restoration is the "Uncle Doug" series of videos. He's very easy to listen to, explains things well and has a good balance of practicality coupled with respect for the age of the stuff he works on. He works on a Rickenbacker amp - one slightly younger than yours -
here.
I know that your primary aim is functional restoration, but, that being said, it's a good thing to try leave the amp in a condition where a future restorer would be able to put it back into original condition if needed; in other words, don't do anything to it that can't be undone. Document your work and keep the old bits with the amp.
Good luck with the rest of it!