a. projector: look for one that can do short throw and optical zoom
b. speakers: go for separates, subs at the corner. align them ideally at ear level from your seating sweet spot
c. speaker wiring: plan for wires if you later decide from 5.2 to 7.2 or 9.2 if hiding the cables are a challenge when routing from the AVR to the speaker placements.
d. noise: check if your heater/water tank make noise when in operation. if yes work on containing the noise if it can be helped.
e. where to put the screen and 2nd row an option? will depend on your entry to the room, putting more rows may be done if you go 17ft (screen.wall to projector)
e. decide whether to put your equipment horizonally (rack) vertically (in a closet/cabinet) coz all wires emanate from there
f. aircon :go split inverter get whatever recommended capacity of the 17ft x 8ft room + .5hp
g. reduce reflection(lights, surface) at the projector screen/wall area. use darker colors,
h: go for long HDMI 1.4 when investing with projector cables, even if your current PJ is just 720p.
i: for big sports game events, the best ang HD broadcast/PPV over SD
browse the HT gallery. masayang makita yung kanilang transformation.
saw the room pix, you can still go PJ pero also consider a bigger TV for that as an alternative.
the tank may need to be relocated unless you intend to put a door+wall right after the tank.
suggest go pahaba, alaganin yung 8ft di mo malakihan
good luck!