In this short video, it is possible to understand the hard sound design process using one of the most famous tools for sound designers: Sculpture.
Envelope, Morphing, Dynamics and Audio Post Processing.
The dynamic of a Grand piano is very difficult to emulate, that's why hammers are organic, and harmonic are insanely complex to reduce.
This video is around 8 minutes long, but the audio processing can take at least 42 hours due to get a very faithful sound.
Enjoy!