How about a system that allows you to create contraptions based on weight? Think of it as a balance scale, you craft the scales, you connect them and start build on the first side, than given the right amount of weight moved onto the other side the scales will move lifting whatever you built. By applying water mechanics and pumps to move liquids we will be able to craft hydraulic systems and elevators. and the most important thing... my castle will have secret moving rooms that came out from the floor by pressing the right button
