About this 3D model

My first attempt at designing and making something for my Mendel Max 1.5 This is an iPad 3 and iPhone 4S combination stand with speaker amplifier for both the iPad and the iPhone. I have a dual charger connected to it so I can charge both of my gadgets at the same time. It'll fit iPhone 3, 3gs, 4, 4S, iPad 2 ( a bit loose thanks to comment from downeym), iPad3, and at least one model of the the iTouch. Any comments feel free.