I don't have a hard case or I would send it to you.
Do what I do, use a thick cardboard box.
For feral cats, that is what they would probably need for transport.
I put Miss Lucy in a semi hard case after she had delivery of her kittens and she tore that
case to pieces before I could even get it to the truck. I was shocked because it was a very
cute heavy duty carrier. She shredded it, got out, ran for her life.
I then put her in a
rather thick cardboard box and that did work. She couldn't get out of the cardboard.
Well, I don't know what else to tell you. Either allow them to run around outside and feed
them when you have the food to feed them or locate a shelter that is a no kill shelter.
The problem with keeping them, you are contributing to the over population without having
them fixed. One cat can result in thousands of offspring. One cat can have say six kittens
and those six kittens each have six kittens and those.....and so on.
THIS IS the problem. Find a no kill shelter.