What about my room, speaker position and ceiling question?

I suggest you re-read the "stickies" at the top of the forum but here's some help.

1.) realtraps.com/art_room-setup.htm

2.) I actually could not find any thing about windows in the stickies but here's what I remember: Treat windows like you would regular walls. If you need an absorber there, hang one in front of it or put one on a stand in front of it so if you want to look out of it, you can move the absorber.

3.) Below is from ethanwiner.com/acoustics.html you need to scroll down and you can see a picture of absorbers mounted over the peak. You'll remember it from the first time you read it when you see it.

"A peaked ceiling is better than a flat ceiling because it avoids the echoes and ringing that occur when the ceiling is parallel to the floor. But a peak creates a focusing effect, much like a parabolic dish, which is less than ideal. For this reason it's a good idea to place absorption or diffusion under the peaked portion, as shown in the photo below.

MiniTraps on the ceiling
These MiniTraps (commercial acoustic panels) were installed under the peaked ceiling in the author's home recording studio to avoid focusing sound in the room to the area under the peak. Top
One somewhat controversial aspect of control room design is soffit mounting the main loudspeakers. Most home studio owners simply put their speakers on stands, or sit them on the mixing desk, and leave it at that. But many pro studios prefer to install the speakers into the wall so the front surface of the speaker cabinet is flush with the wall. There are sound scientific reasons to use soffit mounting, yet some engineers say it's not necessary or that it gives poorer results. Those in favor of soffit mounting point out that it reduces reflections called Speaker Boundary Interference, or SBIR, that cause peaks and dips in the low frequency response. If a loudspeaker is out in the room away from the wall, low frequencies from the rear of the cabinet will bounce off the wall behind it and eventually collide with the direct sound coming from the front of the speaker. (Even though it may not seem obvious, very low frequencies do in fact leave a speaker cabinet in all directions.) Proponents also claim that soffit mounting improves stereo imaging by reducing mid and high frequency reflections.

I happen to side with those in favor of soffit mounting, yet I also respect the opinions of those who disagree. One thing nobody will dispute is that soffit mounting requires a lot more effort! If you do use soffit mounting, please understand that the speakers must be built into the real wall. You can't just apply a lightweight facade around the front of the speaker cabinet and expect the same results."

Also see Hexspa's you tubes on setting up a room.