I have no idea the background behind this but it very well could also not be an actual piano. I mean, i do woodworking and making something that shape wouldn't rly be all THAT hard. Its all the inside shit that's the hard part. It would have to be hollow anyway to fin the fan and vent and shit in there. It would actually be easier to build a whole new shell shaped like a piano than to hollow out an actual piano without damaging the exterior.

Like i said, idk if that what was done. Just offering my take.