Well Heinrich,
Based on what I've read here and on other fora, I have to come to the conclusion that it is impossible to build an accurate (scale) model of ships from basically any era, with the remark that the further back you travel, the less accurate the information becomes and the larger the variations may get. Adding to the mix is the scale in which we work, complicating matters even further.
Any model, I argue, is an interpretation of, firstly, the kit-designer/-manufacturer and, secondly, the builder of the available information of the subject. What you have done is nothing more, nothing less than your interpretation of the data you had at your disposal, using Kolderstok's kit as your starting point.
It would be very interesting to have an evaluation of the currently three interpretations of the expedition ship of Willem Barentsz.
With regard to your WB-modelling exercise; I'm looking forward to a) the completion of your second build and b) your interpretation (in solid hardware) of the data, collected by the Russians.