Welcome and great pics, love the 'head shot.'
I also vote for a Ferret Nation 182. I have two boys in it and it's perfect. Nice and big for them to run around and the like and so many ways to have fun with it once you take out the plastic (or cover it in fleece) and start putting in wood shelves :D
Chins are not like cats or dogs. They can take a long time to warm up to you and even when they are more comfortable around you most don't enjoy being held or cuddled. Give them time to adjust to their surroundings and try to provide them with a consistent routine. Here are some bonding tips...
People have already covered how to baby-proof your cage in an easy, cost effective manner.
As for the kits: have they been sexed? Can you post pics so that we can help you sex them? This will be important for determining the length of time that the kits can stay with the mom.
Storing...
I give my boys a little flower pot of botanical hay 2-3 times a week and they absolutely love it! I also mix it up and sometimes they get orchard grass or sometimes oat hay. Timothy hay is, of course, available 24/7.
I hope things go well for you and I extra hope that after the quarantine and introduction process that the two get along like happy little clams! If this chin doesn't end up coming home with you I'm sure the right one will find its fuzzy little way to you eventually :)
This cage looks fantastic. One thing I would mention is that you might want to consider adding safety hammocks. Sometimes chins are less than graceful so it's important to minimize the distance they have to fall if they don't make one of their jumps. Hammocks are a great way to brighten up a...
Your chin might have caught giardia if there was a time when the water wasn't being filtered properly which would mean a visit to the vet and a fecal sample
Or cover the plastic with pillow-case style fleece covers :)
Congrats on your new FN! I was super excited when I got mine and now I have to restrain myself from going double wide...I really don't have enough room in the house to do it otherwise I probs would have done it already XD Have you...