Brief iPad Control Concept
Walk button on screen
While holding down walk button, tilt forward slightly to go ahead, tilt left and right to scuttle left and right
Three fingers to turn aim
Touch screen anywhere to aim and place brick
Double tap with two fingers to bring up brick menu
Swipe to scroll (brick cart, inventory)
Touch GUI buttons to make inventory appear and disappear, for light, and for emotes
Jet / jump combo button on GUI
Clean GUI, building and moving controls are gestures and tilting. Easy. You don't need as many build controls with a touch screen, thats what people don't get. It would also make sense to skip any unnecessary features like macro or Self Delete.