It seems like your grandkids know what they want to be at a young age. Just like the others, I am excited to see photos, maybe you can try using an image hosting site, or simply use the attached file if there's one on this forum.
Now that's cool. They did a job well done with this project considering the fact that they are just in high school. Finding auto parts is easy for new cars, I usually visit 4WheelOnline. I wonder where their supplies came from.
It's not easy to modify classic cars, finding parts is getting tough nowadays. I guess it really depends on the person's passion to restore and upgrade a car like Model T.