Many thanks Nana
Yes I do it my self (exept the bellow, I'll make a new one next summer)
So, My first job was Cabinet Maker French varnish maker and Violin and bow maker).
Varnish is french varnish (Vernis au tampon, in french).
For the Brass I used a Ultrasonic engin and after a polish engin (find in a special shop for gunner and bullets).
Like you I do not make varnish on brass parts
I made too the replica case, like Air Force case in 1930.
In french, you can fin more information at this link:
And more pics on my www page:
Have a good day.