Yep ... Instead of getting in line for the ride, enter and pass-through the gift shop where you can continue on to all the displays at the end of the ride. There will be displays where you can spend as much time as you like (keeping in mind that others may be in line to design as well) designing a car
TIP: Do this before you ride and you can tap your magic band or card when boarding to use this design for your next ride ... just make sure not to tap your magic band when in the queue design room as it'll override any previous designs.