The hardest part of our engineering project so far was coming up with the process of building our invention, we have an idea of what we wanted to build, but getting at the components and software together is defiantly something that is not easy to do. So far I am very proud of the huge document we have, full of information and other components of our project on one huge document.
For future capstone students, I really recommend not leaving your assignments to the last minute and do them ahead of time, because when the building phase hits, you are going to need as much time as you can get.