I ordered 10 board with only these components assembled during pc production.  Seeed Fusion services were utilized and I sent them the board Gerber files and this short BOM:

I purchased most the other components shown here and assembled my board.  A complete BOM is in the files section of this post.

Find a way to raise the board for part insertion.  Turn board over and solder each step.  I use another blank board to hold the parts down while I flip the board.  These photos are in the order you will want to use from shortest to tallest part.

I ordered some 3 position headers so I didn't have to break apart a header but you need 39 to a single 40 pin header will work just fine for this step