Yea I agree with Cassidy, you should think about bending the grids for the ramp, its a waste of space to have them flat, I had a ramp and since I bent them there is more room.
How steep is that ramp? It may hurt a pig's spine, or if it falls, the result can be fatal. You might want to expand the cage so you can make the ramp more horizontal. It also does not look big enough, but with plently of toys like you have in there the pig will not get bored. Great job, otherwise