Conversions & Upgrades

Engineering Exceptional Sports Cars

Some cars deserve more than a service. They deserve engineering.

At Harper Sports Cars, we specialise in the complete transformation, restoration and enhancement of iconic sports cars. From full chassis-up builds and sympathetic restorations to bespoke performance upgrades and complex vehicle conversions, every project is approached with the craftsmanship, precision and engineering excellence that has become synonymous with Craig Harper.

We work with owners who are passionate about their cars and who are looking for specialist engineering solutions that improve performance, drivability, reliability and long-term value.

Whether your project involves a classic Cobra, Porsche 356, GT40, Lotus Seven or a modern performance car requiring bespoke engineering, we deliver solutions that combine originality with modern engineering principles.

Engineering Beyond Restoration

A true restomod is far more than replacing parts or refreshing paintwork.

It is about understanding how every mechanical, structural and electrical system works together and then engineering a vehicle that performs better than it ever has before.

Craig Harper is recognised for his ability to integrate complex vehicle systems into a cohesive package, ensuring the engine, transmission, suspension, steering, braking and electrical systems work seamlessly together. This systems engineering approach is what separates an exceptional sports car from an ordinary restoration.

Our Specialist Services

We undertake complete and partial vehicle projects including:

• Complete Restomod builds
• Chassis-up restorations
• Bespoke engineering solutions
• Engine rebuilding and performance upgrades
• Engine conversions
• Gearbox and clutch upgrades
• Differential upgrades
• Suspension design, tuning and upgrades
• Brake system upgrades
• Power steering conversions
• Left-hand drive to right-hand drive conversions
• Body restoration and panel alignment
• Fibreglass body repairs refinement andspraypaint

Every project is individually engineered around the owner’s vision while preserving the character of the vehicle.

Specialist Left-Hand Drive to Right-Hand Drive Conversions

Few workshops have genuine experience converting specialist sports cars from left-hand drive to right-hand drive.

Craig Harper has personally completed more than 20 complex LHD to RHD conversions, designing and engineering each vehicle so that it feels as though it left the factory that way.

These are not cosmetic dashboard swaps.

Each conversion considers steering geometry, pedal placement, braking systems, suspension geometry, ergonomics, electrical integration and structural integrity to ensure the finished vehicle performs safely, reliably and naturally.

Proven Engineering Experience

Craig’s experience extends across some of the world’s most recognised sports and race-inspired cars.

Projects have included:

• Ferrari P4 recreation built from the chassis upward using a bespoke chassis, suspension and kit body
• GT40 engine and gearbox conversions
• GT40 suspension and braking upgrades
• Complete commissioning of previously non-running vehicles
• Multiple Cobra restorations and upgrades
• Lotus Seven engineering and performance improvements
• Lotus Exige restoration and upgrades
• Lotus Elan restoration
• Lotus Esprit restoration
• Porsche 911 restoration and performance upgrades
• Porsche 356 restoration
• Porsche Speedster builds and upgrades
• Porsche Boxster engineering projects
• McLaren M1 restoration and specialist engineering

Each project brings its own engineering challenges and solving those challenges is where decades of experience make the difference.

Built Around Engineering Excellence

Craig Harper has spent a lifetime designing, building, racing and developing high-performance sports cars.

Unlike many restoration businesses that focus solely on replacing components, Craig approaches every vehicle as an integrated engineering system.

His background in vehicle design and development allows him to redesign mechanical systems, improve reliability, optimise performance and solve problems that many workshops simply cannot.

This depth of experience enables Harper Sports Cars to undertake projects that require innovation, precision and original engineering thinking.