Those look like some pretty luxurious bunny thrones!
Howeverrrrrr .... I'm thinking like the others and would be hesitant on any non-natural fibres.
But what do I know?
Maybe they wouldn't nibbles on the man-made fibres? And thus, why not to use the naturals?
But I hardly doubt it!
It might be some questions that you should ask the rescue people before you go into mass production.
BWT PumpkinSundae ... did you get your machine problem figured out from awhile back?
What was the problem?