SD, I sit corrected! (And moderately astonished.)
WB, presuming the interior plywood was glued to the framing between the windows (I think I see that in the upper picture, left member) and the framing glued to the exterior skin, that's a pretty dandy 'stressed skin' structure over all and a 'composite column' between the windows. Too bad the detailing was so pitiful for the window seals! Too bad the Meranti or similar Luan-ish wood is so susceptible to rot!
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