I completed the last three railings for the staircase today by machining the holes needed to connect and secure the balusters to the rail. The anatomy of the rail is pictured below. The balusters are slid over the connector to mate with the rail at an angle of 32.5 degrees. The ends of the rails have a threaded metal insert that will accept a fastener to secure it to the Newell posts. One end of the rail has a 16.25 degree compound joint followed by a mitered right angle return. The rail itself was made by laminating non-overlapping 4 foot long sections of bamboo plywood together (for a perfect match to the stair treads).