Hey guys, I have a three piece assembly that I am trying to put together. I made all of the parts myself so maybe there is a problem in the part. I attached the pieces and what it should look like when its all connected.  I hope someone can help guide me into making it mate together. Also I know the lens has tabs and the faceplate part doesnt have the pockets for it yet, so if you have any tips on how to make those pockets symetrical to fit that would be great.

Edit: Now that I look at it seems some of the parts are really not symmetrical enough to fit into each other, I believe that might be my problem