As a labor of love to my 2 year old daughter, I built her a playhouse over
the summer.

Playhouse is 8'x6'. Did the framing, used T-111 for siding, and put an
asphalt roof on.

So now, I'm trying to decide how to do the inside. Currently the inside
is unfinished. There's nails exposed in the underside of the roof
sheathing as well as the walls.

I'm thinking of using drywall for the inside walls (and catheral ceiling).
My concern is that the drywall could get wet (she might leave the windows
open or the door).

Someone has suggested luan for the inside. So I'm looking for ideas. Any
suggestions?

Thanks