Small edit - counter is available through the web. Linked below:
http://sielim.ghost.pl/gk/rotorSTv1.html

Aditionally - I did PDF versions of the counter, so that it can be printed and glued to fit into a paper version of calculator... before posting - I will try out myself on - whether it works fine, or rather not. Will see :) I hope to print it out tomorrow + glue onto some 'solid bases'. And we'll see how it looks / works.