You know, just a stupid thing: Once you’re upgrading your (for example) warp gates, and they don’t have capacity filled up to max, you can’t use them! They count as 0 size that way. Same is for training camp, factory and starport. They recruit the things that you recruited before (for example) 10 marines, but you can’t train another one once it’s upgrading. Please leave a comment if you agree/disagree.