I don't have any dimensions for you, but here's what to expect if you open it up.
This is a hero tier, so expect a slightly different soundboard, but it should be pretty similar. The champion tier may not have diodes between the rumble and LED power since it doesn't need to account for color mixing.
The battery should be ~69.35mm long with a ~18.73mm diameter. The motor has a smaller diameter than the battery and is fairly thin. The Sabercore should be smaller than the Spark Color 2, but I don't have the dimensions to verify.