ok lets see what i can come up with.
the black box in the centre of the rear sub frame looks like a pgm 1 from a 18. the smaller box zip tied to the side looks like a 16 RC valve control unit. from what i can rember if you use 18 PGM and loom the 16 servo motor runs backwards so that could be why the 16 unit is grafted in.
the sub frame looks like 18 with a bit of 16 stuck on the end. the front fairing stay is all wrong for a 16 its an 18 one. the 16 frame does not have the holes to fit the stay so if it looks drilled and tapped its a 16 frame if it looks like all the other frame inserts i,d say it an 18 frame.
the front and rear end are 18.