|Thanks to Wikipedia for the image of this Pfalz EI|
As far as my lessons learnt is concerned, if I make another mono-plane (and most probably will) I will construct a central steel frame or use brass rod to support the strain of the rigging. Also, using fishing line caused a bunch up around the central hub which became trickier to glue toward the end. As the plastic frame bent before finally breaking, the tension was released and my rigging lines begun to bag. I have effected a brass rod support, drilled through the fuselage behind the rigging frame which, whilst obvious, appears to have done the trick. I'll just have to live with it.