The various modules out there that do this sort of thing tend to work by some trickery.
Basically you need to replicated in your own module the processes that happen on the skin/container layers.

Also as a rule these aggregation type modules tend to be runtime only systems - that is - if you look at the pages in EDIT mode you see the modules on the standard dnn layout - its only at runtme in VIEW mode that the manipulate things to display the modules inside their own render layers.

Westa