Hi guys. I have an issue I have long saught an answer to, but can't find one. I have even spoken to Dave Hamilton about this, and he seems to think he has it sorted, but I don't think I am making myself clear.
I have looked at Apple's Designing Airport Networks PDF, but it's missing too much. This is the network I would like... I am just struggling to create it:

Click the image to enlarge
Basically each client notebook will connect at it's native speed, be able to access a shared Time Capsule for backup, be able to access the internet and play music through AirTunes (equally could be printing via the Airport Express). Even better would be if any machine could play through multiple speakers at once but that requires WDS so I doubt it.
Oh, and the fact that there are two different WiFi networks should be transparent to the user, as should which they use (except the 802.11n devices will feel the power!).
Any ideas as to the WiFi setup in order to make these factors possible?