Has anyone tried to reconstruct the alien vessels using the visible parts from the wreck sites? I don't possess such skills but from what I have seen/read on the threads it may be that someone else does. We could get an idea of size and profile.
Further, the wreck on HIP 17862 looks very organic, could these ships have been grown instead of manufactured?
Why assume that they are ships? If they are organic why couldn't they be living creatures? Creatures evolved to live in the void of space?