Despite the fact GSO's website shows the exact same image for the
16" as for the
12" solid tube design, the story apparently is that the 16" GSO will be a truss tube (as per Andrew's Communications add in recent months) - supposedly with 3 single straight heavy trusses, not the multiple cross-braced trusses as per the Lightbridge version.
All I can say is I'm dying to get a look at it!