OK, just create a custom widget and add some QLabels, some QLCDNumbers, and my BarWidget (which you can, of course, modify to better fit your needs) to it. If layouts won't work and the size, theme, or language will never change, then you can use absolute positioning for the widgets.

That curved bar indicator thing would be doable in the same fashion as my BarWidget did it, but it would be immensely complicated to get that curved shape, especially if you want it to stretch to any size. Maybe you can do it with pre-made images drawn using an image editor?