what's the min. population to be able to build a ship

i.e I know for size 1 ships it's 7.1 billion (right?)

what is it for size 2 and 3?

ok - you found in Shipeditor "Shipsize"

than you have to look in BuildingEditor e.g.
- 86 Coalition Spacedock - needs habitants 7 bn (sheet Prerequisites) - can build Shipsize 0 (sheet "Specials")
- 87 Type 1 Coalition Shipyard - needs habitants 12 bn - can build Shipsize 1
- 88 Type 2 Coalition Shipyard - needs habitants 25 bn - can build Shipsize 2
- 89 Utopia Planitia Yard - needs habitants 49 bn - can build Shipsize 3

sheet "Information" -> equivalent ID's other Majors - the have own values, even some minors ship yards

here is shiplist as xls http://bote-forum.square7.ch/wiki_files ... t.data.xls

here is buildings as xls http://bote-forum.square7.ch/wiki_files ... 6V0.80.xls

attached one of my old xls but there are in the first sheet german (eg Sternenbasis) und english (star base) names