I can definitely verify that its 10 per shipyard. I have 5 shipyards on Irkalla with 1 tier of advanced shipyards and 115 max objects. Not sure where the extra 5 come from (100 from shipyards, 10 from starting count, 5 from other colonies besides homeworld?). If you get +1 object per colony (just going with that idea since that could explain my 115), that could also explain how he got up to 1026 objects, if he has 1000 from shipyards, 10 from starting, and 16 colonies?