Well, all of my HVAC rough-in is done. It only set me back a cool $2,500... but I feel it was well spent since I have no experience with HVAC and it certainly wasn't a 1 man job......
Here's the front left corner of the HT where the return box is. A 10" duct is attached and it's a standard 14x20 box. I'll mount this right in the top corner and it will be out of sight behind the proscenium and fabric. There are 2 - 8" supply ducts coming into the room and you can see 1 of them in this pic.
This one is taken from the front... you can see the supply ducts on the sides. I will arrange them so they blow air out towards the middle of the room, instead of downwards.
This is where the new air handler is gonna go. Most likely I'll be installing a Carrier system that controls both temperature and humidity. They put a VFD on the air handler so it can control the fan speed. For humidity control, it runs the fan at a slow speed to allow the coils to remove moisture, but not really affect the temperature too much. I like that feature, especially since this is in a basement.
Another one from the outside of the room, looking at the screen wall.
I have some more framing to finish up and quite a bit of wiring to do before my first inspection.