I just found out Instructables has a free premium membership for teachers:

https://www.instructables.com/teachers/

If you aren’t familiar, Instructables.com has instructions for everything submitted by users.  Really, I think you could find instructions for a Flux Capacitor and a good Korean BBQ.

They also break things down by grades.

Matt Cadorette

Librarian

Waterford High School

20 Rope Ferry Road

Waterford, CT 06385

860-437-6956

mcadorette@waterfordschools.org

Twitter: @lancerlibrary

“As for me, I am tormented with an everlasting itch for things remote. I love to sail forbidden seas, and land on barbarous coasts”  Herman Melville, Moby Dick