Important Highschool Experience: Keep it or leave it?

I currently go to a non-target school studying Finance and Information Systems and am going into my senior year of college. I'm targeting management consulting firms for an internship (I'm graduating in Fall 2020, not Spring 2020, because I have a couple extra classes to finish).

I completely understand why and when I should remove high school experience. Generally, seniors aren't supposed to have any high school stuff on their resumes unless its a very special case. I've removed almost everything years ago except for one thing. I think it has a lot of transferable skills to consulting in general. I do have a couple other things that I can list in that space instead but it would be nothing substantial (i.e cashier, volunteer experience, etc.). I have 2 prior internships, one with the Dept of Treasury and another with the Big 4 already listed on my resume.

The experience in question is a 4 year engineering program I took at my high school. The final year was a year long team project where we had to research a global or local problem and solve it using what we learned in the prior 4 years. We'd go through multiple iterations of different solutions on paper and then model them using Autodesk. Finally, once we settled on a final design, we'd create a prototype. I decided that it was worthwhile for our group to test this locally and record data. I then compiled it and created a slide deck documenting our process, final product, and results. We had to present this slide deck to actual engineers where they would give us feedback about our solution at the end of the year.

I was the team leader on this project. I had to carry the weight of a reluctant and unfaithful member. I'm proud of what we did and what I learned. However, that was a long time ago and I need your thoughts on whether or not this should be included.