Great project and you did an excellent job. Kool Lemon is always a favorite!
I can't tell if the bend is normal or not. I built the below '69 or '70 Super Sport for my wife well over a decade ago. The bike and frame had been horribly cared for and I ended up using a modern Shimano Nexus 8 speed IGA and dynamo for the wheels, etc. This is the best picture I have for comparison. If I have a chance in the next day or so I'll check the seat tube with a straight edge.