Using the die cut sheets from the kit as stencils I traced and cut out new ribs for the R2, R3 and R4 and ten used the remaining sheeting as a guide sandwiched them to the broken ribs (Photo 1 & 2).
Then repaired the damaged trailing edge (Photo 3).
Replaced sheeting LHS (Photo 4) and then RHS for which I don't seem to have taken a photo - sorry