The cart was a group project in Advanced 3D modeling using Creo 4.0.
Here are some of the sub-assemblies and parts used in the building of the cart. One of the features I showed my teammates was that with a few dimension changes we could use copies of existing parts to create new parts, thus saving quite a bit of time by not having to rebuild all of the parts from scratch.
The pieces above were from my Intro to 3D modeling, using reference plans and sketch planes.