I only experienced the pounding once on our Jeanneau, it is dead iron up hill wind and confused sea. I was just barely able to maintain 3 to 4 kn with 2000 rpm.
The pounding was so severe that I can hear anywhere on the boat. I was not trying to sleep in V-berth, just try to get my fouled weather gear out. The pounding was fearful.
According to Jeanneau, the panel is particle board with veneer and solid wood trims. I am not sure if the particle board they use are marine grade or IKEA grade. If it is the IKEA grade, 10 min submerge in water will totally destroy the interior of the boat.