Quite easy to build. The problem is to get ahold of the parts.

Get a well know console controller, take out the two actuators and mount them in any other form factors you like.

You can drive them with an audio pipeline, they are effectively a 4 ohm speaker. Attach them to a sound card and you can have your stereo haptics subwoofers.

You have to filter out aggressively the resonance frequency of the actuator to get a flattish response. Not that subpac or the other folks do so