Regarding the font size I also notice that size is different in KDE from Gnome, also the lineedit boxes are very smaller in KDE, than in Gnome. I also had problems whit translation. Some setences can become bigger in different languages so in portuguese, my labels where "cutting" the words. I had to enlarge the size of the labels in the Qtdesigner. I'll have to check if there's a way to get the size of the text ant set the label size based on that