We have seen a bunch of cool Alexa based projects recently. If drones are your thing, you may want to give this project by RichardWensile a look. It is all about making a voice controlled 3D printed tricopter. The drone is flown and controlled with voice control through a Raspberry Pi ground station.
The tricopter is tiny but its motor can lift up to 3 kg. You will need 3 brushless motors, propellers, power distribution board, battery, and a few other parts to get started.