[Richard A]

           
It's finished at last.
24 metres each lane x 3
18mm MDF. Dulux Paint. 11mm slot depth. 5mm Copper Braid.
Race Coordinator Timing including sector timing.
Drivers rostrum for 3 + 2 stations at strategic points around the track.
All with individual call buttons. 
Laptop display and separate TV monitor.
IR timing gantry. Arduino Uno and relays. Ability to run both directions.