That is a wicked playhouse, I know a couple of kids that would love that. I agree with tinysparks though. But, given that you shot at f2.8 already, I'm not sure you're going to be able to do much about the DOF. The small sensor size in the G9 means you get a pretty sizeable DOF anyway (I know I do with my Z2) at a focal length of 7.4mm. You could try focusing on the trolley right in front of you, then recompose, perhaps get in really really close to the trolley to reduce the lens working distance.