That is a very small width, but if you have the determination and drive to make it work then I'm sure that you can.
First of all, try to make and post a floorplan with your basic idea and dimensions. Include ideas for your stage, number of rows, riser, door location, etc. The more the better as that is a huge help for people trying to give advice. What is the length of this room?
Depending on the length of the room, you may be able to do two rows of two recliners with one aisle on the side.
Don't worry too much about speakers, projector, colors, etc. at this point. The important thing is to plan out the rooms construction then fill it with those things.
Once you get your layout all planned out, then we can dive into the specifics of construction techniques and answer your questions.
Welcome to AVS!!