If you can take the time to plough through the 90+ pages to find it, there is a series of photographs on the Hangar 9 27% Extra 260 thread in the 3D Fling Forum that shows the quick way to handle this.

Basically, you use a sanding drum on a Dremel to grind out relief cuts in that former. The easy way to do THAT is to cut a hole in the fuse bottom covering for access. This was a piece of cake on the H9 Extra. But the CG Sukhoi is all stringers back there. Doable, but tricky.

What I ended up doing was using a cordless Dremel and getting my daughter, with her skinny arms, to reach back there through the canopy hatch opening to hog out the former. The Sukhoi fuse is short enough for this.

Another RCU'er simply took a piece of sharpened brass tubing, inserted from the cable openings in the rear fuse, and drilled holes in the former, taking care to ensure that the holes were properly aligned. He then used short pieces of plastic pushrod housing to protect the cables. This is the way to do it, IMO, as you don't weaken the former nearly as much. Naturally, I saw this idea AFTER I had hogged out the former with a sanding drum...[8

At any rate, you have to do SOMETHING. If you allow those cables to rub against the former, even sheathed with plastic tubing as they show, you're asking for problems IMO. Another possibility might be to use a really long servo horn; then, when the cables are crossed, they might clear the former. But look at the set-up; the rudder servo horn and cables are already in the way of the wing bolts; if you make the horn longer, that will simply make installing the wing retaining bolts that much more difficult.

If I were to get another CG Sukhoi, the FIRST thing I would is re-locate the rudder servo tray. Working around those cables to install the wing bolts got to be a real PITA.