I used fiberglass to thicken up the joiners. It took a couple of layers to get it right.

For the slots in the wings, you will need to sand down the slots to get the joiners to fit in properly. MUST SURE YOU USED 45 OR 1 HOUR EPOXY. I used 30 min epoxy to get the joiners into the wing and I just got them in.

Hey, if you ever need help email VF, they will respond very quickly. Great customer support. I am thinking about picking up the extra for a winter build.