Will this network setup work?

I'm trying to fix my network setup in my house and here is what I am thinking of doing:

In Office:
• DSL Router
• Airport Extreme Base Station
• USB Hard Drive attached to AEBS
• Slinglink (or some powerline network extender)

In Living Room:
• Other side of Slinglink
• Ethernet from Slinglink to Mac Mini (media center), Dish Network DVR, and Airport Express
• Have the airport express broadcast a wireless network so our laptops work in the living room
• Stereo connected to airport express for AirTunes (kind of redundant with the Mac Mini there, I know)

My main issue is that my living room is right on the edge of my AEBS wireless network range, so connection in there is really spotty. I'm already have everything except the SlingLink. The thing I want to make sure I can do, is have the airport express that is connected to the SlingLink in the living room broadcast the same wireless network that my AEBS in the office is (so that I can connect to the USB hard drive and computers that are on the wireless network from my AEBS).

Hopefully this all makes sense. If anyone can confirm that this will work the way it seems to in my head, that would be wonderful.

Thanks.

 

I dont think it is a matter of being far - I have a feeling it is the plaster walls. I tried switching it to N only, and the signal only got worse. So, there is probably just too much interference between the AEBS and the living room.