These are snapshots from the version I'm currently using, with the Metal GTK theme. The window manager is Sawfish, with the MicroGUI theme.
The main window. On the left is the vfolder list; you can see the SQL query in the box at the bottom. The message itself is shown in the notebook on the right, one attachment per pane. Want more of Thog's Favourites? Try the Thog's Masterclass page in the the Ansible archives.) Obsolete: the 0.2 version looks slightly different.
The Compose window. This is where you compose new messages. Note the attachments pane.