Yes!!! 3rd system for the win! Funny timing. I'm planning my own bedroom setup myself. I think I have the TV narrowed down. Already have the audio and video gear. The wiring to locate all the gear to a nearby closet is going to be a chore, but worth it. I've never really had a TV in the bedroom before, but now that I have a baby and a toddler, it might the best chance I get to my Game of Thrones on for a while. Haha. I super downsized homes recently so I no longer have the space for a dedicated HT room...for now.
Bedroom setups aren't something we discuss too much around here, so I'm glad to see I'm not alone in wanting something decent in there.
And you are right about wanting to address the ventilation. I'd give your receiver all the room it needs to breath. Even if you end up losing the nice stacking feng shui you have going on with your components. Personally, I'd split them up. AVR on the left, media components on the right. But that's just me.