If that is how you want it to be then it’s fine.
However, I would rub some sandpaper on the edges to make sure there aren’t any sharp pieces (if you haven’t done so already).
It might be deceptive from the picture but with the lid on it doesn’t look like a very big door.
I personally would not have the lid on it as I don’t think it serves the purpose. Hay is most likely it be dragged out the door, rather than over the sides given they are so high, and the lid won’t stop that.
I’d be concerned that’s it’s turned into a one exit hidey. If one piggy tries to go in without being able to see the other is in there, then it could be a flash point for bickering.
You’re never going to stop some hay from getting on the fleece - it’s the downside to fleece bedding!