I recently bought the Samsung Galaxy Note II and noticed that there were not many cases available. So I decided to make my own. After doing this I thought it was a good design exercise and thought I would share it.
This is the most important part. To start with you will probably need a set of calipers so you can measure your phone. Input the length and width of your phone into Autodesk Inventor then extrude to the thickness so you get a block about the same size as your phone. Since we are going to make a case we want our block to be bigger than our phone by about the thickness of the case. So if we are making a case that is 0.100 inches thick then we need to add 0.200 inches to the length and width, and 0.100 to the thickness.