Authorisation for rounding of metric from Society rules IX. B.
B. The metric conversions in the Siege Engines Handbook are mathematically derived and do not necessarily reflect the dimensions of materials available in countries where the metric system is prevalent. The Earls Marshal of SCA Kingdoms with chapters in such countries are authorized to round these converted dimensions for use in their Kingdom’s combat rules, and to minimally revise the dimensions based on the materials available, provided that any such rounding or revision may not diminish the safety of any combat participant or spectator. The measurement system used for Siege activities at an event shall be that which is native to the host group’s Kingdom, unless otherwise published in advance, Angele (talk) 13:28, 16 June 2018 (NZST)