New Baby Pig

Hello everyone! So I decided earlier this month that I would add to my herd of two sows. Ill just start off by saying my two sows are not friends they merely tolerate each others existence, which is fine but one of my pigs used to love to cuddle with her former cage mate so I thought why not another pig. It started with craigslist, their was a women with an accidental pregnancy and the litter needed to go. I picked a baby female (about 1 month old) I picked her up at a neutral location about 30 min away. Well, I took her to the vet a couple days later for a wellness exam and it turns out she is a he. I told the vet I was planning on introducing her to my female pigs, and she was kind enough to give me an estimate on when to come back and the price of the neuter. Anyyways, this is Fig he is a white Abby with a black mask and he is one of the most outgoing pigs I've ever had! At the moment he won't eat any veggies but he devours hay and pellets, especially since I got bluegrass hay from KMS that I mix with his Alfalfa. He is currently in a quarantine cage but I'm going to make a C and C cage out of extra grids, since he will be housed away from the girls until he is neutered and healed from the surgery in 3 months. Meanwhile I've been handling him everyday so he gets used to human touch, since he's a baby pig he is squirmy. This is my baby boy..

Questions:
When should I be worried about him not consuming vegetables?
What can I do to keep him happy without piggy friends for a few months?
What would be a good C and C cage size for a baby pig (I have room for a 2x4)?