It is way too early for any kind of ETA, but I can tell you the flight model will be overhauled to be X-Plane 11 only. Many things were changed in X-Plane 11 that affected the flight model of the Saab. But we updated it as best we could.
The 3D mesh and textures will be done, literally, from square 1, with textures getting the PBR treatment. The mesh is already about 90% complete.
Completely rewritten code with some extra's added.
FMOD sounds implemented.