Disclaimer: I do not have a ceiling layout. However, I do use FasTrack and noise is an issue. On the plus side, I use carpet pad and green-turf-style carpet and it keeps the noise to a minimum. Also, I find FasTrack switches extremely reliable so if you really want that siding, it would be easy to do. That said, I use USA Track, three-rail track for Standard Gauge and it's virtually silent. If I was doing a ceiling layout, I would go with good old tinplate track. You can't see the track up there anyway. It's reliable and quiet.
I love ceiling layouts so I'll be interested to see pictures when it's complete. Good luck to you.