Unless something has changed, you must be prepared to have a non-standard screwdriver/turn screw made to allow removal of Le Mat's side plate. That side plate nut requires a "pronged" head - that is, its screw extends through the head, causing the interior of nut's slot to become, in effect, solid with minislots on either edge.
In the past, Pedersoli did not make the screwdriver available for purchase.
While the driver's head is neither difficult or complicated to create, you won't have the head on your complement of conventional screw drivers.
Hope this helps.