Comcast Gateway - Switch - Airport Extreme?

Hi, thank you in advance for taking the time to read and respond!
I've a few things crammed in my structured media panel (metal cabinet in a pantry) to run Ethernet and Coax cables throughout the house. I am planning to add Airport Extreme to the network, and figured it's best to keep it outside of the media panel (in an open view) to get the most out of it. I need some guidance to make sure what I am planning would even work.
Here's a diagram of my current and proposed setup: http://i.imgur.com/my8NcrD.gif
Here are some questions that are bothering/confusing me (in no particular order):
Biggest concern: does it make sense to connect Airport Extreme to a wall plate, or should it be connected to the gateway itself to really take advantage of all it has to offer?
Is it necessary for the Airport Extreme to be placed before the switch?
If it's okay to connect Airport Extreme to the wall plate, can I bridge additional Airport Express or Apple TV to  Airport Extreme?
If it's okay to connect Airport Extreme to the wall plate, would keeping the Linksys there affect performance? Should I remove it altogether, and configure my Wi-Fi and DHCP on the gateway itself? I have no complaints about that router being there, it's working very well as is though it's a G router.
If it's not okay to connect Airport Extreme to the wall plate, is my only option to place Airport Extreme between the gateway and the switch?
If it's not okay to connect Airport Extreme to the wall plate, should I even consider placing it inside a closed media panel (metal enclosure, about 4" deep, assuming it fits)?
Thanks,
MP

Thank you Bob, this is very helpful!
I am assuming that you are running at least CAT5e cabling, and preferably CAT6....and....that the Trendnet switch is Gigabit Ethernet capable. Ethernet can be run up to 330 feet or 100 meters with virtually no loss, so things will be fine as long as your wiring and terminations are correct.
That being said, it is always better to keep things as simple as possible, with as few connections as possible.
I'm running Cat5e. Trendnet switch is Gigabit capable. Wiring and termination appears to be correct as they all lead to working connections in wall plates.
Acknowledging the tip about simplicity.
No, but things would be simpler if it were. In networking, simpler is almost always also better.
I so wanted to use Airport Extreme as my primary router by simply replacing the Linksys, but the location isn't ideal so I was a little disappointed even though I like the media panel so much in general.
Yes, or to the switch or to another wall plate. Again, the simpler the setup, the better.
I specifically mentioned bridging Airport Express to Airport Extreme assuming better compatibility, thus better reliability and performance. I was also thinking connecting to Airport Extreme wirelessly. But you got me curious. If I connect to another wall plate through an Ethernet cable in another room, I would be able to truly extend the range of the Wi-Fi signal as opposed to just strengthening the signal. Is that right?
The Linksys likely has 10/100 Ethernet ports, while the AirPort Extreme will have 10/100/1000 ports. The Ethernet signal will slow down by a factor of ten when it reaches the Linksys router. Not what you want if performance is your goal.
Ah, that makes sense. And I've been trying to find something wrong with the switch as to why I am not picking up Gigabit signal! It's the 10/100 router that downstreams everything at lower rate.
Never put a wireless router inside of anything, much less a metal thing.
Acknowledged. Surprisingly it's been running fine thus far, but I do intend to correct that when I get my hands on the Airport Extreme.
Again, thank you Bob for sharing your knowledge!

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