Existing timed drag track ( Racing) here: https://imgur.com/a/v2EJ1T4 I created this 2-lane drag strip 2 years ago for a birthday party and it still gets heavy use every single week. I'm inspired by our Hot Wheels monster truck downhill transport and Open Track and want to move to a more wide-open setup. No turns just yet, just a wide drag with bottleneck finish and perhaps a criss-cross-crash finish in the future. The existing drag track is simply MDF baseboard with pin hinges for the hill and extra sections. Velcro dots for consistent re-assembly. It helps with storage but it really never gets stored. At times we add a loop and/or the new HWid gate at the finish. The timing system is based on Bill V's derby timers with a plexiglass hinge tilt start/reset. Rechargeable battery for the IR leds with arduino control. Currently trying a new opensource timing system with wifi kiosk modes for extra fun and video replays. I really want to use the 3d printed start with my esp8266 modules, but cant find much documentation on the relays and controls for the start. I'd like to keep the timing, and convert it to a wider open track setup with actuated start. I'm thinking of just doubling the width of the existing MDF and 3d printing the magnetic joints and start gate to incorporate the coroplast. Also wondering if anyone has mounted timing under the coroplast. I'm using the over-kill photo diodes, of course. We also customize our own cars. Great little community here, thanks 3DBotmaker.