PumpkinSundae ... Like Dunster I would follow their instructions, for the fabric/batting choices and construction as they have the knowledge and experience.
That being said, there'd be nothing wrong with your making a bunch for them, according to their instructions. Then finish one the way you think would be better. On delivery, show them your new style and discuss with them. They may say yes, great idea. They may say no, absolutely not. Or they may want to try one or two in your new style and then decide.
What needs to be remembered is that these are not for fancy fine-finished quilts but functional pieces, maybe one step above raw fabric. They may be washed endlessly, or it could be they are used for one cat and then tossed. And maybe too, they have never been shown anything different.
Good Luck!