Quantity   Component name
1 × 18in filled and polished stone floor tile $5 for 4 at the local flooring shop on clearance
18 × 24 gauge solid copper wire Old network cable, used two strands, 18 feet long.
1 × Furnace cement $5 at local hardware store, Meeco brand 'Furnace Cement & Fireplace Mortar, black'
10 × 8 gauge hookup wire had some, but you could buy some for $5
2 × 10 gauge crimp connectors They fit 8 gauge wire, and will be encased in cement anyway