Can you use a roaming network and wireless extender at same time?

Question

Greetings community - I've been struggling with an attempt to extend my wireless network for some time now. Please forgive my ignorance on the topic - I realize how 'simple' this is for many of you.  Let me summarize:
What I have functioning:
1. Comcast telephony modem
2. 5th gen Airport Extreme as main wireless router connected to modem via Ethernet (corner of floor 3)
3. 2nd gen Airport Express as wireless extender (hooked to a stereo on floor 2)
What I want to accomplish:
1. I have poor wireless signal on my sun porch (corner of floor 1 opposite side of building as modem)
Extra equipment I have:
1. Another 5th gen Airport Extreme
2. Another 2nd gen Airport Express
What I have tried (and failed at):
1. Initially I set up the second Airport Extreme as a second wireless extender and placed it at a further point away than my first wireless extender.  I quickly realized that set up does not function appropriately and one cannot connect to the further extender (I read about that on the apple forums).
2. I tried placing the second Airport Extreme in a different part of the house at equal distance from the main router as the first wireless extender.  It's capability to extend was minimal if any.
3. I tried connecting the Airport Extreme to the main router via an Ethernet cable with the hopes of creating a roaming network (which I read about on the apple forums). I would have to come up with a way to run the Ethernet through the house but I'm willing to cross that bridge later.  Once I got that set up, the 2nd gen Airport Express which was previously set up as a wireless extender is no longer recognized. Argh!!
Questions/Theories/Suggestions:
1. Is it possible to have a wired extender (via Ethernet) function at the same time as a separate wireless extender all connected to the same router?  If so how do I do it?
2. I thought about keeping Airport Extreme #1 wireless connected to Airport Express #1 and call that Network 1.  Then plug Airport Extreme #2 directly into the modem to create Network #2 and use Airport Express #2 as wireless extender.  When I tried plugging both Airport Extremes into the modem, they both stopped functioning.
3. Do I get a second modem to put somewhere else in the house and use Airport Extreme #2 and Airport Express #2 in that fashion?  My guess is Comcast will try to charge me a separate internet access fee to do that (boo!!).
I know there are a lot of brilliant folks out there.  I'm sure someone can read this and see the 'obvious errors' in my ideas and attempts.  I'm certainly open to new suggestions as well. 
Thank you in advance for your time and advice.
- The New Guy

Answer 1

Is is possible to rename the AEx 2 a different network name from the AEx1 and AE 1 (even though they are all connected to each other)? And say it is possible, would that potentially preventing the jumping?
No, in extend wireless the names must be the same..
However since you are creating a network on AE2 which is extended by AEx2 then you can indeed use a different name.. but it must be both,, AE2 and AEx2.
2. Even more crazy - if I did (could) give the AEx 2 a different network name, could I use my AE 2 as a wireless extension to that second network?  Or is this just getting out of hand now?
You have lost me now.. there are ways and means.. but let me recommend a better solution.
Use EOP (homeplug in US) adapters if you cannot run ethernet. Multi-storey houses where you have heavy concrete construction are never going to work well with wireless alone. You are much better getting ethernet properly installed (which is the only 100% guaranteed method).. or buy a set of EOP adapters and give them a try.. they work in some cases and not others.. but better than wireless when they do work.
Otherwise I think you need higher power wireless routers.. but I can suggest you do the setup in a more controlled manner.
In other words do not use auto as per the airport utility.. use very short wireless names, different for both bands.. and fixed wireless channels.. then test which band works better.. Then you can do a link.. which will be slow but might give you better performance.
So..
Link1 Main AE1---- AEx1 This is wireless extend.
Link2 AEx1--ethernet--AE2. AE2 is in bridge mode and is also set to create a wireless network. (Use different wireless name here to prevent confusion).
Link3 AE2-----AEx2 Second wireless extend.
This overcomes the Apple limitation on multiple extends. It is not great setup but might get wireless to where you need it.. And better speed than you can get now.
NOTE>. I would personally never do this.. I will run ethernet forevermore.. having tried and tried in various places and using all kinds of equipment.. my conclusion is.. wireless is not suitable.. unless you can get enough signal in from one AP.. everything behind it must be ethernet.
It is much more expensive in some cases.. but ethernet works.. nothing else can be guaranteed to work.