height between stock heatsink and bottom

[schepers_cp]

basically i want to know what the free height is of the pinebook's mainboard's thermal spreader and the bottom panel, as i want to improve cooling (and perhaps overclock a little) once mine arrives so it doesnt thermal throttle anymore.

any idea how much space free there is? :O

if barely none, then i'll mount a 0.2mm copper film on part the backside, to spread out the heat.