Here are some pics of the hvac, water, water, plumbing, and electrical issues that I will need to deal with. In the following picture my hope is to bring the hvac duct into the cavity between the I-beam and the sewer drain. The concrete foundation wall you see is the same as the front wall of the theater but to the left. This area here will be storage, but the beam, HVAC, Sewer Drain will all be in soffit within the hallway and open in the storage space. That window is on the front wall and I will create a "cap" for it. It will always be accessible, but you will need to remove a fake panel.
In this picture you see the majority of the HVAC, water, and gas line. The concrete wall will be the back wall of the theater. First course of action is getting one large roll off trash container and clearing (you see how I did not say cleaning) out the basement. Too much crap that we should have thrown away 3 years ago when we moved. The finished walls you see are for the stairs to the basement. My idea is to move the hvac under the stair landing and move it completely out of the theater space. The waterline and gas line will be within a soffit (13" x 10") in the theater they are not getting moved. My plan is to have the HVAC peeps move the Freon pipe to the right of the sewer drain.
This picture just shows a closeup of the Freon pipe. I wish the hvac peeps would have put it going above the beam like the water lines. That would have really helped out a ton and not made me need to move them.
This picture shows the space between the sewer pipe and the I-beam. I think it is completely doable. The only issue being the radius of the ducts, but I have some ideas on how to work with that. If t he radius of the ducts gets in the way I may just use and arched doorway, since I am thinking about not including a door to the theater. Two reasons here. First, I want this space to be used when we entertain, ie football & basketball games, movie nights, etc. I don't want to fee that I need to close the door and why put a door in if it will just be open all the time anyway, and second I have two girls at home and I remember what it was like when I was 18! So no privacy for them!
This final picture just shows another I-beam that I will have to deal with. This area will be the wet bar and will have a soffit like the rest of the room. The soffit here will just be extra deep to take into account this I-beam.