7:41:58jackdanieleither way with-room-for-graphics by default inverts Y-axis (first-quadrant key argument) and accepts :height argument
7:42:28jackdanielso if you invoke with-room-for-graphics HEIGHT before the bottom of the pane, then you start at the bottom of it
7:43:12jackdanielin principle you could enforce min-height height and max-height of the pane to be exactly as height you want, but that requires creating your own pane and defining method for space requirements