Thanks Darzy, I like that idea...

anyone else have some insight?

Choosing the long wall or the short wall for the tv depends on how big the screen is. If you have a big screen tv already, move it in and give it a try in both positions with the sofa opposite. Put the sofa on those easy-move saucers so you can move it around. The window glare can be handled with black out curtains or shades. You may find four swivel chairs will give you some flexibility, or consider two smallish recliners plus two swivel chairs.

I agree with apple pie, but I think I'd use a cardboard template before moving the tv. And make sure you use blackout curtains, if you plan on watching/game playing during the day. We're doing similar with our office, and those curtains are a must!

I can see the small size of the room, when you are already into, it will reflect smaller space, my opinion is to use a projector that you can display different sizes and on different walls according to the purpose.

For the seating elements, try to use small and light objects with colourful pattern that flows with your accessories and what about adding small side tables to fulfil the purpose and when not needed you can easily store.

Desks and top surfaces are preferred to follow the folding techniques, try foldable hinges and sliding mechanisms; use the wall to mount tools for space saving and decoration, depends on what kind of studio you are working on.

Try a bit lighter colour for the wall to give you wide space feeling and darker matching floor.

GOOD LUCK