Alright, totally went out of my mind ! Untill yesterday that it !
I have scanned the page, I'll do the link in a bit.
But just remembered, that on the M. Simons book, only the formers for the Ka1 are shown !
On top of my head, if I remember well, if you do a search on the Retroplane website, there is a dxf file with the Ka3 formers, made by Julio Correira.
Not too sure, but I'll have a look !
Fred