you have a tool called the "Paths tool"
that will be how you lay out the rivets
take the default skin and make it a layer... add a new transparent layer above that.....take your paths tool and left click at the start of a row of rivets
(remember make sure your new layer is selected in the layer stack)
a small hollow circle will appear.....now left click at the other end of the same row of rivets a line will appear connecting the two circles....
TIP- when you left click if you hold it down and drag two small squares called control points...will appear next to the circle you can grab a square and move the line with it...this is good for riveting around curves (also make sure your color is Black in the tool box)
lay out all the small rivet lines first (its good just to practice on a new image just to get it down)
once you are satisfied with the lines (you can grab any of the circles and move them once they have been placed.)
right click go to "edit" down on the list will be "stroke path" a window opens.....at the top make sure line width is 1 px
uncheck "antialiasing"
click the "+" at "line style" at "dash preset" choose "normal dots" then click "stroke"
bang rivets
now say you are doing the wing instead of redoing it again you can go to the layer stack at the top there are "layer dialog" "channel dialog" and "Path dialog" if they are not there go to windows up top of your edit window go to "dockable dialogs" and select the paths....
now that path dialog is chosen click the little eye so it can be seen...choose the "move tool" in the tool box under "move" you can select
"layer" "selection" or "path" choose "path"
now you can move the path to wherever you want.....if needed you can choose the "flip tool" and reverse the direction ether vertically or horizontally
again each tool you must select the "paths" in the "move" section of the tool box.
remember to reselect the "layer" in the toolbox...for the tools you use...
(for larger rivets make the line width 2)
I have a layer for the different size rivets...
well that should do it hopefully its understandable and I didn't forget anything