[Users] Possibility of UI extension via custom pane/external window?

[Jerry]

Would it be possible for a Python script run by Claws Mail to manage a
custom pane (frame) integrated within Claws Mail's UI? For example, to
display some real-time information (generated by the Python script)
relating to the sender of the message that is currently highlighed in
the message list, or to display some notification of some sort, or
whatever. In case integrating a custom pane within the current Ui was
really impossible, would it be possible for the Python script to
decrease the size of the window in which Claws Mail is running, then
to open an external window right below CM's window, or beside it, and
manage its contents? Of course, this would require that the Python
script be constantly running, since the contents of that window would
have to be updated depending of the current events taking place in
Claws Mail.
Have any similar things ever been done in Claws Mail?
Do you envisage any impediments to the realization of such an
extension to Claws Mail?

Thanks