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With some Power Functions elements and a few extra pieces, it's pretty easy to turn the Rally Car into an RC car. Here's a quick demo video of my design in action. And here are the instructions I made for it. Required extra pieces First you are going to need some extra pieces: Power Functions: 1x - Servo Motor 1x - IR Receiver 1x - Battery Box 1x - L-...


4

You're describing rebrickable: https://rebrickable.com/ Besides official models, also hundreds of fan created models are available. It's a terrific resource


4

You can use the Compare Sets function on Rebrickable for that (if the B model is an official model or a MOC on Rebrickable). Here an example for both official models from the 42069 set.


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