It actually worked out perfectly with Mr Bubbles on the bottom and Scruffy on the top. Scruffy loves to sit up and survey the room while Mr Bubbles prefers a little more privacy. It's funny because out of the 4 guinea pigs, Scruffy is the only one who can leap onto the built in platform. The other 3 are too fat to jump up. I'm going to have to make ramps for the others LOL! They all love the shelter provided by the under part of the platform. I should have done this long ago.
Scruffy is 1.92 lbs. Healthy weight, but an ounce or two wouldn't hurt. His teeth are good from what they could tell. That was starting to be a concern when he was sick with his bowel infection, but he's chewed them down nicely on his own. They couldn't tell about his molars, but his front teeth are good. When the front ones are good, it's usually an indication that the molars are too. Especially since he's not showing any signs of problems, such as slobbering or inability to chew and eat.
Both hearts and lungs are clear and normal. Eyes and ears too. Urine and droppings normal too. A pair of happy and healthy guys. The larger cages and outdoor activities have a lot to do with their weights being healthy.