On the movement widgets; Star Wars Legion uses something very similar and while the lengths are proprietary they're not... really. What they're doing is accounting for base size to create front to front measurements while measuring front to back. You can see it pretty clearly here:
Surprisingly, even the larger bases account for this by being lengths that add exact inches over the base. In any case, it's probably worth checking as I bet this game's measurement tools can be pretty trivially replaced with a tape measure. We often use one for Legion, though the widgets are useful enough I tend to use them still.