Is there going to be any 3D space you can throw the stuff around in, also, seems like it doesn't have any gravity. It needs gravity to be.... Right.And of course more objects :d

Oh and the parts should collide with each other...

Man this really needs more polishing that i thought. If you make the 3D space, we need something to throw at the objects. A prime example would be making the shapeability max, toughness max and stiffness max and start throwing metallic balls. Then the whatever you would use would deform. Would fit the wall so good :P