Michael W. Holmes did it!
A new, critical GNT:
Some more background: ETC blog
Oh this was so long overdue!
I think it is important to have more critical texts out there, the NA monopoly is/was not good.
Update: Michael Hanel created BW files: Download them here!
There is one version without diacritics and one with them.
Jim Darlack converted the apparatus for Bibleworks: Download here!