My advice to your team is to design a cart that is
LIGHT WEIGHT. Y u ask?
Because soon as you put tools and spare parts in it it will get mighty heavy!!!
Also one that has a door or doors that is big enough to put spare parts in. One BIG piece of advice is that it fits through any door in your school. Are doors at school are 35 inches wide. Are cart is 34. Also how are you going to bring it to the events? Make sure its not to tall and can fit in a van for transportation to and from. Good luck.