I agree, it's a great idea. I had a wood playhouse as a kid (way back in the 60's before they made those plastic ones) and I keep thinking I wish I could have it for a rabbit hutch. It was more like a shed, which is my dream to convert a shed to a rabbit house with an attached run. Of course, I sometimes dream bigger and want a bunny barn!
My grandniece and nephew have a rabbit in an outdoor hutch, but they take it into their play house for playtime. Again, their playhouse is a big shed-type building.