Hi Angela!
Test Track is one of my little Mouseketeer's favorite attractions. In fact, he waited patiently for two hours during our trip last month to enjoy his "must-do"! It sounds like our boys have some things in common because one of his favorite parts about the experience is getting a chance to design his own car to test out during the ride, just like your son. I am happy to say that the portion of the queue where Guests can design their car is open again, so your son will be able to test his engineering skills out as part of the experience! Keep in mind that the Single Rider queue bypasses this element of the attraction, so that's an option you and your son probably want to avoid this trip.
Your vacation is just around the corner, so you may be able to enjoy the
Epcot International Festival of the Arts during your trip, as it opens on January 14. This festival gives you the chance to enjoy the arts using all five of your senses while you explore the theme park. Be sure to keep an eye on the
Disney Parks Blog as you count down the final
sleeps until your vacation for the latest news and info about all of the magical things you will be able to experience! T-T-F-N, ta ta for now!
~Crystal