Mission accomplished!
A good soul by the name of Rait Kalda who is based in Estonia, has provided me with a PDF of his manual for the 45S he is restoring, produced in English. It has everything I need including NACA profiles and balance configurations for the flight model and a swag of interesting info to help with finishing the geometry models. I couldn't be happier. Thanks to all who put effort into this. Later this year the model will be released for Microsoft Flight Simulator so anybody who flies the sim, keep an eye out for this gorgeous little twin.