It looks awesome!!
I actually use the same exact cage for my piggies
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As you can see, I currently have it separated into two areas to keep the boy away from the girls ^.^
To echo what others have said, your baby can definitely fit through the bars (so it's a good job you meshed yours), I had to make a temporary lip on mine as well. Once he gets older you can take that down if you want, though, because the older pigs are not able to fit through.
I see you have pads for the floor... this is what I use for my floor, if you're interested in other ideas;
(broken link removed)
It fits the cage absolutely perfectly if you put it in the shape of a square (4 feet by 4 feet). I then use a layer of towels and fleece over the pet cargo liner. The liner can go right into the washer and drier, and it does not stain or shrink. It also protects the floor wonderfully.