A few unrelated observations. I am not suggesting these are structural concerns as I lack the qualifications to make that determination. However, they speak to an awareness of technique which you may want to consider as you progress through your build.
1) Your MK-319-BS rivet on the top appears to have been set not at an angle normal to the surface of the skin (top of image). It's as though it was aligned normal to the table on which the elevator was placed when the rivet was pulled. You can see this if you were to draw a line colinear with the length axis of the rivet. See how that line is not orthogonal to the skin on the top of the image?
2) For the bottom AN426AD3-3.5 rivet, it appears that the dimple may be cracked on the right side (or it could have just been the primer separating due to expansion when the rivet was set).
3) The shape of the shop head is like a trapezoid (the top of the shop head is flatter than the base) suggesting it may have been prematurely work-hardened during riveting.
4) The top face of the bottom dimple is out of plane with the bottom flange of the rib. See how it has angle from left-to-right (the right side of the dimple sits higher than the left)? It suggests that during dimpling, the rib was at an angle relative to the dimple dies (dice?).
Originally Posted by mulde35d