I don't know about bubble levels... of course they're useful, but do they fit with the style of the camera? You'd need to find something small and unobtrusive that fits with that old-fashioned style of the camera, not one of these massive neon-green things.
I agree. I have the brass plate and spirit level glass tube from an old Rabone level which I intend to fit to a wooden camera one day.
I do like the white finish with the redd bellows.
"People who say things won't work are a dime a dozen. People who figure out how to make things work are worth a fortune" - Dave Rat.