So is that a current pic and the dry walls/ceiling aren't in place yet? If so, you can just run much of the wiring behind the dry walls and inside/above the ceiling. Shouldn't need to run them along the floor. I guess you can hang speakers off the ceiling just for the (2) rear surrounds if...
Welcome to HTF, Nicholas!
Offhand, I'm wondering why retractable screen since this is a dedicated space in basement. Retractable usually means compromise to quality (on top of higher cost and setup/maintenance trickiness). Unless that's a definite must-have (typically in a mixed-use living...