The comments at the top of Default_AI_Construction_Vehicles.Txt file say:
Entry X Planet Per Item:
Number of planets per each item in 10ths.
(20 = 2.0: We want 1 item for every 2 planets we have.)
Wouldn't that mean that planets per item := 1 means only one weapon platform for every 1/10 a planet equals build one weapon platform for every 10 planets?
Thanks for any help. I don't have any experience or opinion on this. I'm just going by what I read at the top of the file.