Which BB-8 is that?
That's what I thought. Custom antenna?
Cheers dude lm near half way with the underside.... Issue 50 has a great underside layout of the replica(page 10,11) but it can differ from the studio ESB falcon on close up inspections but it's a great ref I'm still waiting for more actual photos around the front end under to make more details/marks & blast points etc....as Mr Dymszo says there's no absolute but lm planing on as near as possible...