ET

I think you will find that SM test fly their prototypes using foam wings for speed of construction before making composite wings. If you look at a few of the test videos you will see the obechie wings. Of course I may be wrong and they are composite wings without the outer layer of epoxy material.I assume the model dimensions etc. do not change for the production version. The videos all seem to feature non- retracting gear so maybe they are fixed gears for test purposes which tends to reinforce my view that the wings are foam and do not have retracts?

John