Here is an excavator building kit with over 4300 pieces that lets you build a 1:17 excavator that can be controlled via your smartphone. It can drive in all directions and has a moving, telescoping arm. This model measures 46cm x 80cm x 30cm when completed.
More gadgets like this: here
The BUILO YC-GC004 Excavator ships with an easy-to-follow manual.
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