I recently acquired an old Rhodes keyboard and have been tinkering around with it. The action is a very rudimentary design compared to the piano and I have been wondering if anyone has attempted to customize a Rhodes with a grand piano action. I suspect it would be possible.

I did a complete tuning on it and it sounds great. Though it is fairly easy to change the pitch on each tine, it is difficult to tune since you can not listen to the note and tune it at the same time (the tuning spring is attached to the tine, so adjusting it stops the vibration).