Hi Ziggy, I haven't actually got the track rod end fitted yet. The standard one tapers where it goes through the hub, the Compbrake one doesn't so it doesn't fit the standard hub. I need to. Speak to them to see what they intended as it's meant to be a direct replacement. Will update when I know. Anyway bump steer isn't much of a concern on a track only car. Won't be used on road.
Re. The bumpers, plan is to go with bonnet pins around the bumper for quick release lightness!