Excellent First for Metal Inlay Jeffery,
As you mentioned the components are recovered from salvaged Pens, and that makes sense when you are learning new skills.
It looks like your insert was a Soda Can. I think for a Gold Pen I would have tried to use Brass, you can obtain 0.025" or 0.030" shim stock that would better suit the Gold hardware. But that is just talking about the appearance.
Looking at you Technique, In general it looks excellent, though on the Nib End insert it looks like there may have been some movement or a gap, at the Joint, or it might just be a bit of something picked up.
It is most important that the surfaces being glued to the insert have to be flat and true, that way the Insert doesn't need to try to conform and under pressure to uneven surfaces, and results in a close fitting Joint.
Great effort, I think you can confidently use new complete kits now.
Congratulations,
Brian.