Oesterreichischer Flugzeugwerke

Hi

After the war there was build in Austria a two seat sports plane, OFW OK-15.
It was a design of Otto Kauba.
Who can help me with more details?
Such as:
Drawings, if possible with construction details;
Dimensions;
Pictures, if possible also during the construction;
How and in which colors was it painted;
Other details/matreials

Thanks
Jan