Hi guys 1st of all very sorry since im new in this forum and not familiar yet on the rules...and im just thinking in future version of COC the village with more than 2 builders can work as one upon creation or upgrading a unit....whether the units are currently in progress the players can assign additonal builder that will help the unit to be update on fastest time. Offcourse there will be additional cost and I know you can calculate the fair cost for this action.