Completed race car in full competition livery, roll cage visible through Lexan windows, sitting on slicks at ride height on polished shop floor

After — Grid Ready

Stripped donor shell on rotisserie, bare metal surface pitted and gray, wiring harness dangling, interior gutted to bare steel

Before — Donor Shell

From shell to grid.

Chassis Fabrication — Est. 2009

Drag to reveal

Spec Your Build

Build Archive

Every car, a build story.

Click any build to walk through fabrication stage by stage — annotated in engineer's language.

3 active builds shown

GT4Pirelli GT4 Series

Porsche 718 GT4 CS

Full FIA roll cage, suspension overhaul, data system integration

LMP3 prototype race car on track at night, headlights illuminating circuit, aerodynamic bodywork highlighted

EnduranceEuropean Le Mans Series

LMP3 Endurance Prototype

Full chassis rebuild, aerodynamic overhaul, WEC-spec fire suppression

Subaru Impreza hillclimb car on gravel stage, dust cloud behind, wide-arch bodywork and large rear wing visible

HillclimbBritish Hillclimb Championship

Subaru Impreza S14 Hillclimb

Sequential transmission conversion, custom aero, gravel-spec cage

Disciplines

One workshop.
Every discipline.

From a gentleman driver's first GT4 campaign to a factory team's spare chassis — the spec sheet is what changes, not the standard.

GT4 race car in pit lane, mechanics working, sponsor livery and slick tyres visible

GT / Touring

Pirelli GT4 · GT3 · BTCC

FIA Annex J compliant cages, data integration, full prep to series minimum weight.

23 builds

since 2020

Endurance

ELMS · Britcar · 24h Series

WEC fire suppression, multi-driver seat adjusters, 24h-spec wiring and plumbing protocols.

8 builds

including 3 × Le Mans entries

Hillclimb

BHC · MSUK Gravel · Prescott

MSA gravel-spec cage reinforcement, sequential conversions, gravel-map ECU calibration.

15 builds

tarmac and gravel spec

Classic 1970s rally car on forest stage, period-correct livery, fog lights mounted on front bumper

Historic Rally

BHRC · Classic Mallory · HERO

FIA Historic Technical Passport documentation, period-legal cage solutions, sympathetic fabrication.

11 restorations

period-correct to FIA HTP

“

We handed Chassis a bare shell on a Monday and collected a finished, FIA-certified GT4 car eight weeks later. The build bible alone is worth the invoice — every fastener torqued, every decision documented. We've used four fabricators across three countries. None of them work like this.

James Rutherford

Team Principal, Rutherford Motorsport

Build Process

Eight weeks.
Grid-ready.

Every build runs to the same protocol. The timeline is a commitment, not an estimate. If we say eight weeks, we mean seven days before the deadline — not the day after.

Builds completed

100%

On-time delivery

FIA rejections

Intake & Specification

Week 1

Discipline, donor vehicle, series regulations, budget envelope, and target date reviewed in a single 90-minute call. Specification document issued within 48 hours — every line a commitment.

Engineering & Materials

Weeks 1–2

CAD model of cage geometry, suspension pickup geometry, and aero package finalised. Materials ordered against spec — no substitutions without written approval. Steel certified to EN 10025.

Fabrication

Weeks 2–6

TIG-stacked cage, CNC-milled brackets, wiring loom built on board. Weekly photo reports sent every Friday at 17:00. Client visits welcome by appointment — PPE provided.

Assembly & Systems

Weeks 6–7

Mechanical assembly, wiring, plumbing, and fire suppression fitted. All torque-sensitive fasteners recorded in the build bible — every nut and bolt accountable.

Dyno & Shakedown

Week 7–8

Minimum 4-hour rolling road session. Data logged, map finalised, setup sheet written. Car delivered on trailer with full documentation pack — FIA homologation papers, build bible, baseline log.

Ready to commission your build?

Tell us your discipline, donor vehicle, budget range, and target series. We'll confirm availability and issue a specification within 48 hours.