The narrator faces the challenge of rebuilding the McLaren 720s, including the need for a new tub and converting the drive.

• The narrator introduces the damaged McLaren 720s and the challenges faced, including the need for a new tub.
• Richard Hammond doubts the project can be completed by Christmas, which is in three weeks.
• The narrator is optimistic and plans to drive the car despite the extensive work that remains.

The narrator begins reassembling the car's interior, starting with the dashboard components and wiring.

• The interior of the car, which was minimally damaged, is being reassembled, starting with the screen and carbon surround.
• The order of reassembly is crucial, and the narrator methodically installs each component.
• The process includes fitting the rear view mirror, roof lining, interior light, and sun visors.

The car is converted to left-hand drive, and the narrator explains the rationale behind this decision.

• Despite being in the UK, the car is converted to left-hand drive due to the undamaged parts from the left-hand drive donor car.
• This decision is based on the cost-effectiveness of using existing parts over purchasing new ones for a right-hand drive conversion.

The narrator tackles the suspension rebuild, sources parts from a breaker's yard, and discusses the costs.

• The suspension rebuild is crucial, and the process is underway with the narrator and his companion Chris working on it.
• They source many suspension parts from a breaker's yard, which they visit to strip a 720s for parts.
• The narrator reveals the high costs of suspension parts, like a secondhand suspension unit from a 675 LT.

A detailed explanation and demonstration are given for assembling the car's suspension system.

• The narrator installs the lower wishbone, rear tire rod, drive shaft, and top wishbone on one side of the suspension.
• After fitting the wheel hub and sensor, the suspension strut and spring are mounted, with some difficulty.
• The narrator explains the function of the anti-roll bar and the high cost of replacing carbon brake discs.

The narrator explains the complex hydraulic suspension system of the McLaren and the need for specialized setup.

• The narrator describes the hydraulic linked suspension system, which adjusts fluid flow based on driving mode and cornering forces.
• Electronic valves control fluid flow for comfort or sport settings, and the system requires careful bleeding to function correctly.
• The system's complexity necessitates professional setup by McLaren, using special tools to bleed the hydraulic lines.

The narrator completes the suspension assembly, connecting the hydraulic lines and installing the anti-roll bar.

• The narrator connects the hydraulic lines to the suspension dampers and secures them tightly.
• An anti-roll bar is installed, and the narrator searches for drop links to complete the assembly.

The narrator discusses the cost and installation of carbon brake discs and the hydraulic wing system.

• Carbon brake discs are installed, and the narrator shares his experience with their performance.
• The hydraulic wing system is connected, but the narrator is unsure how the hydraulic fluid system operates.

The narrator fills various car fluids and encounters problems when attempting to start the car.

• Coolant and gearbox fluid are added to the car, but there are issues with vacuum filling the coolant.
• Upon starting the car, it smokes, and the narrator discovers a radiator leak from a secondhand part.

The narrator troubleshoots the car's issues, including a vacuum leak and a faulty radiator.

• The narrator discovers a vacuum leak due to a missing hose clip and replaces the leaking radiator.
• There is a sponsored segment promoting Car Vertical, a service for checking a car's history.
• After resolving the vacuum issue, the narrator continues testing the car's systems.

The narrator fits the last components and attempts to start the car, leading to engine troubles.

• The final components, including radiator and airon lines, are installed as the car is prepared for another start attempt.
• The car starts but fails to go into gear, and smoke appears, indicating potential engine issues.
• The narrator tests for a blown head gasket, but the test is inconclusive, and further problems arise.

The rebuild project ends with engine failure, smoking, and unresolved gearbox issues.

• The car fails to maintain a running state, with smoke and a blown oil cap suggesting severe engine problems.
• The narrator concludes that the head gasket may be compromised, and the video ends with the car's rebuild in jeopardy.