I have managed to salvage quite a few NPR wrecks which had pretty good technology compared to my own, especially in the area of electronic warfare. I have noticed that by turning the 'own tech only' flag off in the designer I can make designs which include these. Does this mean that I can actually build ships using these components from scratch, or do I have to have the components already available in my stockpile from salvaging?
I have also somehow managed to get hold of an alien missile design after two of their ships surrended to me when I occupied a planet; while the ordnance loading screen shows it, it doesn't show up in my list of buildable missiles. This is suggesting to me that I have to have the components in order to include them?