Here's a low-poly grand piano that I made in Blender 2.79. It has 88 keys like in real life (also built to scale). I think it might be a great asset in your Blender scenes or video games. It took me about 2 hours to make and I am sure this would save you some time. I built this model because I am using it in my earthquake simulations that I am making using a bullet constraints builder add-on. NO TEXTURES used.

You can see my 3D grand piano in this video: Grand Piano vs. 10 Earthquakes (Comparison video) (youtube.com)

INFO: 

verts: 2958

face: 1925

tris: 5072

objects: 106