The Sim Racing Rig
This extrusion rig is built from a Bosch Rexroth (BR) compatible extrusion produced by KJN in Leicester, UK. The extrusion comes with a 10mm slot. I was replacing a wooden rig that didn’t allow for much adjustability – extrusion excels in this aspect and is a near perfect material for building your own sim-rig
Version 1 was designed around Logitech G923 pedals and after a later upgrade to Heusinkveld Sprint Pedals when I decided to flip my pedals in order to improve access to the mounting bolts I added the longer front uprights with some horizontal supports (Version 2). The final step was to add a support on the side for gearbox/handbrake mounts (Version 3). At the same time I changed the way the dash mounts were done for a cleaner design.


Version 3

BOM
The following build of materials (BOM) is for Version 3 and covers what one would need to order from KJN (or alternative) to replicate the rig. Download a PDF Drawing here.
Extrusion Cutting List
Description | Type | Length | Qty | |
SM | Side Member | 120 x 40 | 1350 | 2 |
FPP | Front Pedal Pillars | 80 x 40 | 500 | 2 |
BP | Bulkhead Pillars | 80 x 40 | 1200 | 2 |
CM | Cross Members (between SMs & FPPs) | 80 x 40 | 500 | 5 |
DCM | Dash Cross Member (between BP) | 80 x 40 | 580 | 2 |
DR | Dash Rails | 40 x 40 | 600 | 2 |
SR | Seat Rails | 40 x 40 | 540 | 2 |
SDR | Side Dash Rail | 80 x 40 | 800 | 1 |
SDRS | Side Dash Rail Support | 40 x 40 | 360 | 1 |
Connection Elements
Description | Type | Qty |
Right Angle Bracket | 40 x 40 | 49 |
Tilting Bracket (with fixings) | 40 x 40 | 4 |
T-Bolt & Nut (2 / Bracket) | M8 x 20 | 106 |
T Nut (Pedal Board, Dash and Seat Rails plus some extras) | M8 | 20 |
End Cap | 120 x 40 | 4 |
End Cap | 80 x 40 | 5 |
End Cap | 40 x 40 | 6 |
Driver Positioning and FOV
The following image as a guide for correct seating position and control arrangement. Everything seems to be in the right place or close enough and there is plenty of adjustment. With the Modern FOV Calculator I was able to get an acceptable FOV with a 50″ screen.

The Seat
I have fitted a front seat from a Honda Civic Type R to the rig. The original mount brackets were ground off and the rivet holes left increased to 8.5mm. This allowed M8x12mm bolts with T-Nuts to be used to secure the seat to the seat rails. Note: This is an early picture and I later adjusted the seat so it sat ~5mm from the end of the rails not the ~100mm as shown as this gave better leg length range.

Dashboard
The dash is made from a piece of Oak although other most other woods would work. Its 20mm x 770mm x 240mm and this zip file contains a PDF of the drawing and a DXF.

Pedal Flip Upgrade
In order to flip the Heusinkveld Sprint Pedals a small shim was required to attach the back bolts. You can download it from Printables.
