An adult can fit into it, but you have to crouch down (or at least I do - I am 5'8-1/2"). If you built up a frame with a slot out for extra door height, it would make it much easier for cleaning, but then you would have to figure out an extra panel on hinges along the bottom. Or perhaps you could attach an extension to the bottom door from the inside so you don't see all of the extra hardware.
I've been storing a bunch of my equipment in it while I've been working on the big coop, and it's been raining like crazy. Nothing's gotten wet! If you wanted some reassurance, some spray foam insulation like Great Stuff would work just fine. Try to avoid the window and door insulation... though it doesn't expand much, it is nasty yellow in color and very messy. I had to paint and repaint around my windows to cover the yucky color. Try some of the other gap filler stuff (it should be white), but don't use too much because it
will expand and get hard.
Yes, the cedar smell is fairly strong. That's direct out of the box though. Now that it's been sitting outside for a few weeks there is less of a smell... In fact, I just walked outside and took a sniff. There was barely any smell at all... but I have painted it with latex exterior house paint.
... Maybe I'll be building the kids a new playhouse in the spring AND another coop!
Building the floor was probably the easiest part! I definitely definitely recommend pre-drilling your holes. Otherwise, when you go to use your power drill to get your screws into place, they will angle themselves in every which direction except where you want them to go.
Getting it on the platform already built was another issue. Please please build your platform first and put it where you plan on keeping your coop permanently, then construct the playhouse on top of it. Otherwise you may drop the unit like I did and end up breaking a bunch of pieces. FYI, even though I dropped my house, when I called the company up to order replacement parts, they sent them all to me free of charge.
And I even explained to the lady that it was my fault it was broken. I hadn't even sent in my registration card. They took my registration information over the phone and were very nice and helpful.
I don't notice any drafts when I am sitting in it, so long as my shutters are closed and locked up. But it's also sitting directly next to my bigger coop, so that shields it from wind coming in from that direction, and we are in the middle of a 2.5 acre parcel of land thickly covered in trees, which also acts as a barrier. You may have different results if you are building this in an open expanse standing by itself.
I think when I go to clean it, I will a broom to sweep it out and other long-handled cleaning objects to scrub it down without having to actually crawl into it.