Well that's an amazing instrument, i presume it's straight strung? I didn't see any clear images of the inside of the piano, how the harp was constructed etc.

Well that's an amazing instrument, i presume it's straight strung? I didn't see any clear images of the inside of the piano, how the harp was constructed etc. For the rest of us who want to play around with piano lengths, there is an awesome physically modelled piano software plugin called Pianoteq by modartt (https://www.modartt.com/ https://www.modartt.com/). This is a virtual instrument, but rather than taking the conventional approach of sampling a real instrument, instead this is a model of strings, hammers, sound board etc. This means that the model can be modified to produce a synthetic instrument with different properties. There is a 'length' parameter which allows you to modify the model to be up to 10m long if I remember. There are lots of cool and subtle effects to be had from altering how the hammers behave (how hard they are, the overtones they produce, where on the string they strike etc) to how the piano is tuned (how the unison strings are detuned, how stretched the octaves are etc).