Materials for one cart:
8 steel elbows
1 - 3 ft x 3 ft piece of plywood
2 - 3 ft length of 2 x 4
1 pair of the cheapest roller blade style skates you can find (try the clearance isle at your local sporting good store)
16 bolts/nut sets
soft rope for handles
screwdriver or drill with screwdriver bit
allen wrench to fit the roller blade wheels (frequently is included in the packaging for the skates)
Step 1: Assembling the Base Structure
Use screws that will be flat with the surface so students will not nick themselves on screw heads while riding the cart.
Step 2: Attach the wheels
Its very important to do this step carefully, and use a T-square to make sure the wheels are perfectly aligned.
Use the right angle brackets to attach the wheels to the cart on the 2 x 4's as shown in the photo.