Here is a cool building kit with over 4100 pieces that comes with everything you need to put together your own app controlled 1:17 excavator. It comes with ABS blocks and a detailed construction guide. The completed model measures 80 x 46 x 30cm.
This excavator can move in all directions. It has a telescopic front moving arm. You can not only control it with your phone but also a convenient remote.[where to get it]