I cut the new ribs out of 3/32 sheet balsa and glued them to remains of Ribs #2 & #3. I used yellow glue to attach them making sure I had plenty of squeeze-out between the old and new ribs. After I took the pictures I did clean up the excess glue.

After the ribs had dried a couple of hours I added some 3/16 X ¼ balsa to the spar and 3/32 sheet under the remaining factory sheet to support the new sheeting. The factory sheeting is most likely metric since 1/16 sheet was thinner and the 3/32 sheeting was thicker. I opted to go thicker and sand the sheeting down to smooth it in. After sheeting and sanding it down I didn’t want to take a chance on sanding too much into the factory sheeting, so I used lightweight spackling to fill in any unevenness and finish the blending. That was sanded smooth after it dried and completed the repair to the center section damage.