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Looks good, Whizbang.!
Keep at it, my man.
Once ya do enough, its like riding a bike. Then you'll want to try collarless pinning.

Took me about 140 pin jobs , before I felt comfortable doing...

Mock it up with micro fasteners, n see how it fits.!

Funny...I just finished one similar to yours, the other day.
https://uploads.tapatalk-cdn.com/20170822/82b1c5b8000b9494ab1c4ae549e7d2c6.jpg

Do you remember what side it came from, it might be a shim.!
For centering the blade

No. They go under the rosette.

Like this:
https://uploads.tapatalk-cdn.com/20170822/d85a939ba2cd3d0508cd847f6f54aed2.jpg
Place rosette on pin, then the little flat washer. Then pass pin through...

The washers are designed to keep from crushing the collar, and to keep the edges of the collars from digging into the scales.
You might have to lightly sand the bottoms of the collars, some have a...