SO3: expansion pack rail length?

Has there been any mention of the rail lengths included in the SO3 expansion packs?

Not specifically. The pages on them mention double the cutting area, but the numbers given seem to be more than twice as large, so it seems to me that they most likely doubled the rail length, and one gets the additional length added to the cutting area.

My rudimentary math calculates the rail length around 1m based on the finished xxl machine dimensions.