If you use CA you might be ok in this section.

If you use other glues and a combination of fiberglass you'll almost definitely be ok.

Personally i'd probably use titebond and then fiberglass the center section. Glue strengths on wood/wood joints go PVA glue -> epoxy -> polyurethane glue from strongest to weakest although in ANY case, the glues are all much stronger than balsa and plywood, so your wood will break first. No scientific tests I've found online test CA at the same time as these other glues so i can't comment on CA strength here. From crash experience though, I know my CA joints usually remain intact and the balsa around the joints break so I'd think its probably perfectly fine as well.


glue strength reference: There are a number of these that have been done with results available online, but the below is what I have bookmarked.
http://www.oldbrownglue.com/pdf/HowS...urGlue_FWW.pdf