The bike is now in my possession so I am posting a few photos
just in case someone can figure out a bit more about the frame.

Rear dropout close-up
Seatstay detail
Rear dropout inside view
Brake Bridge
Seatstay lug
BB cable guide DS
BB cable guide NDS

Also, two photos of the rim. It has no decals or any other writing on the outside.
Rim detail
Braking surface canals