350 gram wings are realistic. The stressed skin composite covering the foam is very stout. What I have observed so far indicates the wings will easily support the loads to at least to 12-15 g.

Having "built" a 12 pound all balsa Extra a couple years ago, with open bay wings, and 1200 squares and powered with a piped DLE55 (35 lbs of thrust), I realized how overbuilt most of these models are. Granted, those 550 square inch panels weighed 18 ounces (500 grams) RTF, but still, they were well designed and constructed to hold up to the wild gyrations of that crate. Some may need to recalibrate their thinking in regard to weight versus the task.

Poorly built wings, the types we saw a few years ago coming from some reputable manufacturers, can weigh double and still fail.