Winglets for a Nimbus 2

I recently purchased a Nimbus 2 ,before the naysayers get started ,I have over 1000 hours of which 70 hours in all flying tails, 450 hours on a kestrel 17 with a drag chute which I used regularly.
The only only issue I have is that I would like the handling to be a bit more responsive, fitting her with a set of winglets would help.
There is no approved mod from the factory for the installation of winglets on a Nimbus2, almost all other models but not the Nimbus2.
Worldwide there are large number of the model flying with winglets.
The CAA here will not approve installation unless they have full documentation,
My request is that owners with wingleted Nimbus2's have a look at their approval documents and installation drawings and calculation sheets to see where I can get
duplicates of the information, who approved it, to enable a grandfather process to satisfy the CAA here .
Any help would be appreciated

please email info to gfoneill at xtra dot co dot nz