I'm looking at buying this cubby house for my daughters birthday but would love some advise on some extras that we would like to add:
1. The cubby house doesn't come with a floor/base so was just wondering what would be the best solution for this? We are looking at sitting it on our grass. (We would prefer to sit it straight on the ground rather than putting the whole cubby/side bits on a decking of some sort - but if that's our only option that's also fine).
2. We were thinking of enclosing the cubby house so the items inside won't get wet when it rains. Do you have any advice on adding windows/covers to the openings to ensure water can't get in? (Again, preferably something that my girls can still open up and let fresh air into but then close and lock almost when it's wet outside). 

Thanks in advance for your help!