I strongly second One Plan's idea about looking for another architect. If this one is not motivated, all the fame in the world is not going to help. An alternative approach to finding an architect is to find some good contractors who have built things you like. Ask them for architects' names. Make sure they work in your price range. In the meantime, you can find out from your local building department what the set back and height restrictions are. Are you required to build parking areas or garage space, what kind of airspace restrictions do you have for neighbors' views and sunlight, that kind of thing. Often this stuff is on city websites or handouts at the office.

Not sure where you are located, I don't think there is a municipality in the US that would not consider this a public space and require an Architect's involvement in any permitted renovations. Might want to check on that with your local building department and if so, just get an Architect on board right away. The find a pro feature on this site is very good for that, or your local AIA chapter.

What's the height of your bathroom and which geyser type ( horizontal or vertical ) you are using at present, all depends on these two things. If you've not bought the geyser then you can opt for horizontal one for the convenience of installing a false ceiling and then on one wall install the geyser. OR You can have a FLAP customize beneath the geyser for the maintenance and have the false ceiling too. For any query, you can revert back.

Well. You may not be able to install a traditional home theater that includes a projector set up to project on a screen as it needs the room to be blacked out when you watch the movie. However, a LED TV with AV receiver and speaker setup should be still possible based on the size of your room. It's your preference. I would advise go for a dedicated HT room if you are investing more on the projector, receiver and speakers. If your investment is less then a living room set up is still okay.