...Next day, time to spackle!
The neighbor's derpy dog, Bolt, sometimes likes to watch me work:

He's quite adorable:

And occasionally derpy:

He's amused by whatever I do, and I'm amused when he goes and humps the paint buckets in their backyard. Ever seen 10lbs of Chihuahua / Spitz mount and make love to a bucket? I have. It's hilarious. And I'm scarred for life.
Back to building though, I used spackle on the wood to smooth seams and cover blemishes. It'll all get painted white anyways, so no need to waste coin on fancy wood putty when I have drywall spackle laying around.

More spackle:

Spackling the roof:

Each seam and screwhole got a good coat:

Also, spackled around the windows to smooth them out. My windows were under $30 each from Ebay, and none came with trim rings. So, they're in there with liquid nails... I used a LOT of spackle to smooth them against the walls:

FINALLY done with spackling:

Even though it doesn't look like much, that's easily 20 hours of spreading spackle over a week.
I went ahead and put up the bathroom wall to spackle/smooth it too. I'll probably fiberglass the whole interior, but a flat surface will be easier to work with. Here's the wall up as I started sanding:

Here's the floor:

It'll taper down to a drain in the side there:

At this point, I was out of luaun plywood, so I sheathed with 3 scraps:

I also realized I had forgotten to add the wall on the other side of the bathroom, under the kitchen cabinets. I added it after I had sanded some, which is why this looks half-sanded, half-crap, all mess.

"Are you done yet? I wanna ball..."
