Anybody Keep 13 Lined Ground Squirrels?

I recently acquired a 13 Lined Ground Squirrel at an auction. I can't find much information on them online specific to care in captivity (aside from laboratory care). He is 1.5 years old and until he came to me, he was being kept in an a hamster cage with a wheel and an inch of shavings. He was being fed catfood, carrots and cheerios.

I've moved him into a larger enclosure with deep shavings, straw and timothy hay. He's got boxes, ceramic pots and PVC pipe to explore. I would like to get him a bigger enclosure soon. He's still eating catfood but I've also added rodent pellets, hay, greens and other veggies. He also enjoys dried bugs.

I am wondering if anybody has any experience with these guys or could direct me to anybody that does?

Thanks!