Wow! That's a masterpiece, hats off to you! The only thing I'd change is the ladder/ramp, a bunny could get their feet caught in the gaps, and it's also a bit on the steep side. Having wide steps attached to the side your bunny can hop on might be a safer option. Other than that it looks amazing.
That looks wonderful! How much did it cost to build, if you don't mind me asking? I'm currently looking for ideas, for building my new bun's pen.
I agree with the other posters though, I would give the bunny a flat ramp. Your bunny could get his/her feet in it and get them stuck (and possibly break them, I learned this the hard way from a very unfortunate experience with one of my buns).