Modify the layout based on test results and practical constraints.
Update drawings and measurements.

Create the main control box, wiring, and electronic actuation systems.
Include diagrams, pinouts, and safety notes.

Create the control interface and electronics for percussion actuation.
Include wiring diagrams and control mappings.

Construct the bellows and motor system that supplies wind to the organ.
Document pressure tests, flow rates, and noise levels

Design the organ layout to fit the chassis, including control panel placement.
Capture sketches, constraints, and initial ideas.

Add precise measurements and expand the design in a larger space (about double size) to allow for unexpected needs.
Record clear dimensions and reserved clearances.

Make final design changes based on full‑system testing.
Capture the “as‑built” layout and any lessons learned.

Install the metallophone in rough‑fit configuration and test actuation and balance with pipes.

Install percussion components for initial testing.
Check clearances, vibration, and access.

Procure a suitable the mobile chassis, such as a golf cart, tug, trailer, or whatever.
Document model, load capacity, and any initial repairs.

Source metallophones, glockenspiels, xylophones, etc.  Construct the metallophone assembly, including bars, frame, and actuators.
Document tuning and mounting.

Create or restore all percussion instruments planned for the organ.
Note materials, mounting, and actuation.

Create, repair, or restore all pipe sets.
Completion criteria: all pipes are functional, reasonably in tune, and mechanically sound.

Construct or repair all three wind chests.
Completion criteria: airtight, valves working, ready to accept pipes.

Rough‑fit pipes, wind chests, bellows, motor, control box, and electronics on the golf cart.
Focus on access, stability, and cable/hose routing.
 

Perform airflow tests, valve checks, tuning passes, and mechanical inspections.
Log issues and proposed fixes

Test percussion alone, then test all organ components together as a unified system.
Log timing, balance, and reliability issues.