basically, the reason i ask, is because from using the vehicle construction system it becomes clear that parts of the same materials but different shapes are not identical (it was a while ago, but i recall at one point having to use specific shapes to get a non-jointed two tile hand cart vehicle versus one with a swivel joint in the middle) and seem to behave differently and i’ve looked everywhere i can think of but i can’t find any actual data about what the shape of the frame changes.