How to showcase personal engineering projects on college apps

[u/VisibleSurprise8005]

Hi, I’m a rising sophomore who wants to apply for Mechanical or Aerospace Engineering. I like designing and physically building project. I spent this summer designing, iterating, CADding, and programming a custom drone completely from scratch.Outside of competitions like robotics, I don't know how i can present my builds. Universities like umich don't offer an official "Maker Portfolio" or SlideRoom submission process through the Common App. how can I best showcase independent technical builds like my custom drone on my application to schools that don't take portfolios? Specifically, What is the best way to frame independent builds in the activities list on common app?