That's looking really good!
There was a period there where Giant was making some really nice Schwinn-badged bikes. As others have said, the frames are worth the time and experimentation, but one needn't be too upset about making changes because they were plentiful. Sort of a happy-place in the spectrum.
Be careful with that modern rear quick release. The external cam style has lower clamping force than the older style internal cam. With horizontal dropouts, you're prone to pulling the wheel forward with low gearing and high torque application to the cranks, such as when pedaling uphill while out of the saddle.