I have finished all the parts of the frame for the walls. The walls are not fastened down to the floor yet. Neither are the front and rear walls fastened to the side walls. Everything is just cut and fastened together as much as is reasonable right now. I am waiting till things are a little further along to fasten everything together.
I'm particularly proud of this corner joint. The parts from the side wall are glued and screwed, but the top rail of the front wall (going out of the picture to the right) is only setting in place for the picture.
Just today, I put the insulation into the bottom of the floor and glued on one piece of the bottom skin of the floor. Rather than do a lap joint of the 1/4" plywood, I am just going to glue a 4" strip over the seam.
Note: Even though I measured the thickness of my frame members and the insulation board several times, and they both were exactly 1.5" every time, the insulation ended up sitting "proud" of the frame members no matter how hard I tried to mash it down. I even got up on top of it and pushed down along the edges with my knees. So, I slathered on super thick beads of construction adhesive, only on the frame members, then clamped and weighted the whole thing down over the frame members. It seems to be filling the tiny bit of a gap just fine. Also, I need more clamps. Those cheap, red ones are only $3.48 each at Walmart. Cheap enough to use then give away when I don't need them anymore.