As stated, this is a repaint and a print of a design by Fitter. The improvement is in the print shop work with the silver finish. Otherwise there is no difference and no further improvement to his design.
I found two build logs for this model. One is a build by Yair of a reduced 1/48 scale of the Fitter file, and the other is a superb build of the print shop version I found on a Polish site ( can't recall it now ).
Here are some pages from the Model-Kom printed version I purchased
The instruction figures are minimal, but are sufficient for the average builder since it is a relatively straight forward build ( except the wing butt joints ).
I also purchased the vacuformed canopy of the Mystre 4 which is similar to this 2c version. Also resin wheels.
Isaac