Tablet Stand - works with iPad 2 and iPad Air

The idea behind the original by Gizmoguyar is exactly what I was looking for as it enables the iPad to be supported at two different angles in both portrait and landscape orientaion. However, I found a few problems which this remix is designed to fix.
1. In the original, the connector piece had 'prongs' which were longer on one side than the other (Maybe because I scaled the original by 25.4 in Netfabb as I use millimetres rather than inches as my default measurement but whatever, the prongs s