Hi Sam,
I don't have a diagram, but the locos you've depicted look very much like the 76cm Porter 0-8-0s - built in 1945- that ran out of Prijedor in what is now Bosnia. I also seem to recall a number of very similar Davenports were also built and some of these I seem to recall seeing on Rob Dickinson's International Steam page.
Best Regards,
Glenn
PS - Are you the "Sam" from Video Sam Productions? If so, I have a copy of your FEGUA tape. Nice.