1931 Roadster with holes in doors

[handlebar99]

I recently bought a 31 roadster from an online estate auction and I have a question about the holes in the doors. My guess is that the ones on the beltline were possibly for side curtains? Not sure about the purpose of the hole in the top of the door.

Thanks in advance for any guidance.

Ray Rice, enjoying the weather with the top down, in Rifton.