Continued prepping the interior surfaces. Masked off the firewall as it is not recommended to have paint on this surface which can give off fumes in the event of fire in the engine compartment.
Added a couple of rivets in empty holes next to the Main Spar slots in the side skins on the left side. Will do the right side when it becomes accessible. Since the Side Skins are interchangable, the holes mark the corners of the respective Spar Slots for cutting.
