Just experimenting with LDD for the first time and thought I'd try to make a 'ball' because it uses only a few parts but involves quite a bit of turning parts around before joining them, therefore good for learning (I thought). So I have made up the six 'sides' and rotated them to the correct orientations but can't join them, because I need to move two sides a half-brick each to enable the third side to fit between. How do you move a connected group of pieces half a brick? Or have I made a mistake somewhere earlier? LXF file attached - I'm currently trying to join the three subassemblies in the front. Thanks for any help.
ball.lxf