Those round leading and trailing edges cause the engine shrouds to overhang the balsa.
With the front of the shroud pulled back a little from the rounded edge, the rear of the cardstock overhangs the trailing edge.
The rib height is good, at 3/8" away from the root edge, it's just a hair off center.
There was some surface cracks at the sharp folds. The thicker the cardstock, the more likely the folds can start to break up.
I trimmed back the back side of the shroud to better fit at the rounded trailing edges.
The rounded wing trailing edge also required trimming back the middle rib.
I brushed on a thin coat of white glue, keeping the glue on the fold, not down the sides.
After the glue dries, some light sanding can smooth some of it out.
From the photos, it also appears that the shrouds also appear to be just a tad too wide as it seems to be overhanging the root edge of the wing, as well as past the corner of the straight section of the wing.
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