We now attach the completed visor to the car.  Here is a picture of the underside of the roof where the sun visor will attach.

The sun visor is now attached by 4 8x32 panhead brass screws, washers, and nuts to the front support brackets.  6 long screws with cup washers are used to attach the sun visor to the front underside of the roof.  It is wood that the visor attaches to.

Here is a side view of the attachment.