User blog comment:FlammeumDraco333/New Idea for Ship Defense/@comment-11135771-20150302032813

Discussed many times, been decided against on every occasion. Currently the rules is pretty much that if you want a shield on something, you have to make a working one in game. I've made one and IIRC I think one other has also been made by someone else (both being on small surface ships), but they're definitely not widely used.