Nice car as well. how do you plan to carry the toolbox to the shows, is your car trailered or something? Toolbox is a nice idea, just seems a little much, remember the show is about your car, don't want to go overboard on the display. The display will get you points, but again, there is such thing as too much.
As for heatwave, you can leave the car there overnight (lots of security there overnight) or you can drive it to your hotel and then back the next day (which is what I do).