Oh nice, are they a type of labyrinth fish? I just kind of glanced at the details before.
I think you could do it, however you can't just dump fish in there and call it good. First off, three fish in each bin is really low - if you lose just one, that's a whole 1/3 of your stock. Also, they breed readily in captivity so even if you do succeed, there will be more than three in there eventually.
You'll need to get trays that are opaque and not translucent in order to prevent heating, and you'll probably need them a little deeper than what you've already described. To be safe I'd suggest having them hooked up to a larger reservoir that's totally shaded to prevent heating by the sun and keep the trays topped off to a minimum low water line. You should do some research on aquaponics (growing crops and fish together) and outdoor fish keeping to get an idea of the tolerances you'll have to maintain and how other people have met those requirements.