So, to make the rear most nose section former a bit stiffer, I added a large 1/4" ply plate, then tried again. Nope, the front-most former on the rear fuselage started to deform then. Great. So I added more 1/4" ply, then added another turnbuckle to keep it together. Problem solved :
I also swapped out my dual-battery switch to a "green" servo power distribution board, that has two battery inputs. The FRSky RX mounts on top of this, and each servo output is now tripled on the board.
I added a bit of detail to the top of the nose (refuelling plate thingy) and have done some overall weathering, as well as this week added drawn-on panel lines.