Welcome here to this friendly WW forum, where there is always room for one more. Depending on the size of your shed, your planned projects, and how close your neighbors are, there will be contained noise, dust, heat, and cold. Consider a lockable shed, and those larger tools should be movable (in-out on wheels) for usage, which IMO may become a pain to work on any project. As for metal or plastic - metal can be "patched", but plastic never seems to stand up to the elements. Be safe.