Thanks for the feedback, I will try Jinks' clear skin. Just in case, the fixed height is for TodayAgenda beta, not WeatherPanel
in case anyone else wants to try something like this.
I installed the Scarybear plug-in to add just a couple of lines between Weatherpanel and TodayAgenda but it shows white lines above and below the blank space. Any way to make these go away or be transparent?