I am in the process of creating a cool interior railing, especially its practical design. This railing will be at the top of a series of stairs leading to a remodeled attic room. Because of the narrow space, the railing needs to be removable for the movement of furniture and other large items. So, the railing will slide into post channels. This way, with a little lift, the entire railing can be removed and placed to the side. Here are a couple of shots of the construction. The first shows the 3-inch square steel tube with the channels being welded into place.
Here is the railing section before the added detail.
