my advice (not being a contractor again) would be to put in a wall that divides the walk-out door side (wind and weather) from the studio with the piano. then, if you open the second door (not aligned with the outside door), it doesn't directly affect the piano. you could have a second door and it would give you privacy and a studio that allows little bro and/or sis to sit outside. or even, if you have less parents and more adult students, a feel that it is a real office/studio. and, it protects your precious piano. maybe you should get the piano in - then put up the wall. french doors would allow you to get the piano out again, but the smaller door would protect the piano better. keep the gas fireplace on the side that is not the piano side. what a cozy retreat!