You could get any idea on some of the cabinets from here.
http://forum.lowyat.net/topic/1000020/+140

As for the speaker placement of the surround speakers, you should take a look at
http://www.dolby.com/consumer/setup/speake...uide/index.html

For speaker wires, you could refer to this.
http://www.audioholics.com/education/cable...ker-cable-gauge

For surround speaker's wiring, they could go above the ceiling.

Depending on your preference. If you are placing your TV onto the wall, then there should be allowance for the wiring behind the wall panel.
You can refer to here.
http://forum.lowyat.net/topic/1943085