How to build a Cathedral, part 4

The altar of the cathedral will be at the left side (as we look at it). On either side of the Altar will be the pipes of the organ. The pipes will also be visible from the outside, which is why there are no louvers at the bottom of the leftmost curved supports. The organ pipes will rest on platforms that act as sound canopies for the choir. In the picture you can see the beginnings of this platform.

Here we can see that there are now three of the straight (tangential) pieces we saw in part 3, and that they are joined together. I think that the rectangular spaces you can see will eventually be filled with glass.