I just got a Lettuce Grow Farmstand, which has a funky netcup size, but want to be able to start seeds in my Aerogarden devices and use Aerogarden sponges. One or two other designs exist out there but I didn't love them aesthetically.
Everything fits the Farmstand curves really only one way, there's a not-easy-to-see arrow for ‘up’ on most of the designs but also just spin it 'round to find the correct orientation.
Here's a collection of accessories that will let you do the same:
The author marked this model as their own original creation.