Your measurements are good, but I think you are forgetting that the FENCER-A had a shorter nose than subsequent variants. When compared to the other aircraft in the picture, such as the FOXHOUND and FLANKERS and FROGFOOT, you will see it matches up to the appropriate size (assuming the older variant). I can tell you it is not a model D or newer because of the lack of stall fences on the VGW housing. The span will not fit because most of the wings are missing except for smaller pieces fitted into the VGW housing.
Keynote ID features such as the integrated canopy, blocked air intakes, vertical stabilizer length, horizontal stabilizer shape, as well as the dorsal spine are all consistent with a FENCER. You can even see the shadow of the small avionics node on top of the dorsal spine, forward of the vertical stabilizer.
Since it does appear to be an older model I looked into the prototype, which was derived from the FLAGON (Su-15), but this aircraft does not have the appropriate horizontal stabilizers to be the Sukhoi T6-1...it has to be a junked early model FENCER.
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My comparison image.
http://s7.directupload.net/images/130730/xd3qp92a.jpg
Keynote ID features such as the integrated canopy, blocked air intakes, vertical stabilizer length, horizontal stabilizer shape, as well as the dorsal spine are all consistent with a FENCER. You can even see the shadow of the small avionics node on top of the dorsal spine, forward of the vertical stabilizer.
Here is an image to help with my explanation.
http://img23.imageshack.us/img23/3002/0szf.jpg