At scene 215, Albert, Vaugn & Marcus are seen constructing a chorus around a Mahogany chest. By scene 218, it's completed:
CUT TO: George runs with the newly completed (MAHOGANY) Chorus, playing chase while the original continues its work.
By scene 235, the Mahogany Chorus is given hands, built by the boys. They experiment until the 8 finger hands become 5 finger hands. By scene 247, it's grown in size:
The Chorus has doubled in size, mainly in the girth of its Limbs.
After the death of Olivia, we see both the Plywood Chorus and Mahogany Chorus dismantled, in scene 264.
The Mahogany Chorus lies dismantled in the back of the tractor.
The Mahogany Chorus is never mentioned again after this scene.