you might want to check out a proper LEGO Technic set, which do away with the bricks almost entirely. Here are the best LEGO Technic sets that you can purchase in 2025. Set: #42179 Age Range ...

In order to keep the bricky appearance of the train engine intact, [Robert] hollowed out a few cheap imitation LEGO bricks to house the electronics. He also cut out slots for JST connectors ...