It can also be purchased as a flat-pack kit with sets of tubes cut to size and ready for assembly at home or even pre-built by the supplier.

Since the cars are hand built and the book design is often modified to some extent, each chassis is unique, but as a rough guide, it weighs around 700 kg when completed.

The book design is based on the Type 9 gearbox, but the list of chassis modifications to fit the bigger MT75 transmission is provided on the Haynes forum.

As the supply of Ford Sierra donors in the UK is waning, the use of Mazda MX-5 is becoming more widespread, with the modifications to the chassis and suspension necessary in order to accept MX-5 components being independently published by the members of the community.

Technically, kit cars are not allowed in Sweden, but provided that most of the components and materials are sourced personally by the builder, it is possible to register them as amateur-built vehicles.

By 2014, 2 completed road-legal Haynes Roadsters have been used in the UK in amateur Motorsport Events run by the MSA at clubman level at tarmac sprints and hill climbs.