Chord inversions/figured bass

[MattBenson]

Hello,

I am composing, for music theory class, and I am wondering how the piano part works as I would like to use it as an accompaniment. What inversions/figured bass does the piano use, and is it consistent for every repetition? I've also noticed that the background parts will sometimes repeat a chord/play with them a bit. How can I make it consistent so I can write it on a staff?

Thanks for the help!
-Matt