You might try a combination of VBox, collapsible panels and lists ( http://hasseg.org/blog/?p=113 ) That should give you all the tools you need.
My Vision of it: (cause I like drawing with pipes and dashes)
VBOX-------------------------
| |
| Collapsing Panel-------- |
| | | |
| | Tile List---------- | |
| | | | | |
| | | Tile | | |
| | | Tile | | |
| | ------------------ | |
| ----------------------- |
| |
| Collapsing Panel-------- |
| | | |
| | Tile List---------- | |
| | | | | |
| | | Tile | | |
| | | Tile | | |
| | ------------------ | |
| ----------------------- |
| |
| Collapsing Panel-------- |
| | | |
| | Tile List---------- | |
| | | | | |
| | | Tile | | |
| | | Tile | | |
| | ------------------ | |
| ----------------------- |
----------------------------