Thanks a lot of to everybody, Axel the only thing that I can say is that surely to work on subjects in a greater scale as 1/12 allows to have many more details of not "too small" dimensions the problem is to have a good documentation;I try to make this kit to the best of my possibilities: it is a gift of my wife.
Looking at my documentation i have realized that the pads holder is wrong in shape and new pieces has been builded.