Hello, Danny. My name is John, just left you a voice mail at the church. I can help give you information how to do this, and some approximate costs....

I noticed that they added more photos on the database https://pipeorgandatabase.org/organ/27156

So I'm getting the view that there's nothing much I can do with the spare bourdon rank I have.
The pedal is currently:
16 bourdon (large)...

That's a big part of pipe organ building, the scales! Generally you start by making one pipe in the middle of the register, and see what it sounds like,...

To add to what Larason just said, often open wood pipes would have a vertical slot in the back of the pipe, and a piece of wood clamped to cover the slot....