This will be Mark Mendonca's plane and he will be setting it up as electric.
The foam coring was done using a CNC machine. The cores were not weighed prior to drilling so I can't determine how much weight was saved.
In raw form the wing panels appear very delicate. However, after sheeting several drilled wings like this from Mark before they all have turned out quite strong when completed. The wing panels as shown in the pictures are currently match sanded to a weight of 110 grams each. This includes the core with tube socket glued in, end of socket sub-rib, trailing edge sub-rib, and carbon fiber on top & bottom.
I can post more pics of the sheeting process & resulting weights if desired.