I used a couple of parts from Alex Senechal's kitbash set you can get here. Some really nice stuff in there. https://www.artstation.com/acms/store
Project I've been using to push myself, extension of this suit project(linked below). aiming to improve anything I wasn't happy with on that as I move into a more polished high poly state. Still a good ways to go. A lot of the issues with that suit stemmed from rushing to early on before deciding on strong forms to build from. Always lay your foundation before starting something complex, a little bit of planning goes a long way! :(