The Playhouse for our Bubbles

We've decided to erect a Playhouse at the corner of the house for the 3 Bubbles!

I've been searching for ideas all around the world wide web but I haven't quite decided which design and layout to start with. At the same time, I am also conceptualising the interior design of our apartment hehehe so many plans to develop and I can't get my eyes off these pretty playhouses  (images from Google)