Erik, yes it is Firing Lines. I have some info regarding tilt/turn etc, but what I am lacking is photos of the interior. I have some from Panzer-Modell and Prime Portal but they do not show the rear of the inside of the front cab, except for the one below (which is German).
The project has been stalled for some time due to work commitments, amongst other things. The tracks look a bit daunting. I've finally got hold of some G3s to spread around my planned projects, which all seem to require them.
Regards
Tim