You guys, I am irrationally excited about this discovery, so I thought I would share here.
I’ve already mentioned it in another bonding thread, but I was looking at a slide show on bonding put together by the Ohio House Rabbit Society, and they mentioned that they had “nose guards” for sale in person or that you could find them online. Looked them up, and they are basically the same idea as NIC storage cube grids, but with teeny tiny mesh. Apparently they are also very popular for making rat cages?
I found them online by just searching “small mesh storage cube grids”! 
I was able to re-make Bonnie’s pen with them and they are AWESOME. I am unreasonably excited to not have to have a double walled fence for her now! I was able to connect them together with tiny zip ties.

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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.