Hey that's great stull y'all are doing.
Since winter is starting to set in, check with Dr. Nate Story at Bright Agrotech, he does aquaponics and his wife has tons of info for integrating into the classroom and tieing it to core curriculum. His stuff is based on vertical aquaponics which could be accesible to different heights and special considerations.
Also, for ADA compliance for kids with special needs (walkers and wheelchairs) you might want to build grow tables out of heat treated
pallets that have closed bottoms and sides to hold the dirt. That way, they can participate while seated and feel like their part of the whole. Indoor worm bins in the classroom can be the new pet, with benefits, while teaching about composting, biological and environmental systems, and synergy.
Sorry, a topic close to my heart as I was going to school and working for 2 school districts before being disabled by a drunk driver.
Oh and check with community garden organizations about school garden projects and funding. Wasatch Community Gardens in Salt Lake
City put out a book a couple of years ago that addressed this issue. Don't know if its still available.
It never hurts to ask, cause you lose nothing if they say no, and you win when they say yes. Hey does that make it a win when?