Life and bad weather have gotten in the way of getting much done on the CT, but we finally got the second window installed today. Before installing the windows we cut the ribs and welded the window frames in. We redid the manufacturer's wiring connections and added grommets, then added our own wiring circuits. We also put in the water inlet, an outdoor porch light, a second lock hasp to lock the bar back when we are inside, and the port for the stove pipe. All of those are easier to put in before the walls are finished. Then it all had to be caulked, insulated, taped, and foam sill seal taped over the metal ribs and framing. Whew! Insulating and doing the walls, wiring, and windows sounds so easy.....and takes so loooong!
We only caulked the floor seams where they met the side walls. We didn't caulk any of the outer siding seams. I think it is important that the sides be somewhat open to allow moisture to escape.
Here is one of the window frames shimmed out to make full wall width. You can also see that the insulation is taped and strips of sill seal are over the ribs and other metal framing.

It isn't visible in this picture, but I did frame (wood) around the water inlet before I insulated. The frame provides something to screw into when putting the outer cover in place.

Here is a picture of the window and water inlet on this side.

And the window, outside light, second hasp, and stove pipe port.

I didn't do any pictures of us cutting out the skin and plywood for the windows. We were too busy between storms just trying to get them in. Basically we cut the outer skin out first with a metal cutoff saw. Then set the plywood in place on the inside so we could scribe it. Then we cut it with a circular saw on the straights and a jig saw on the corners. Put the inside wood back up. Set the window in place and screwed the trim ring in. Oh we also put the putty tape on the window before we put it in.
I think that is most of the steps we have done so far. We have a long long way to go yet. At least as we finish the next steps it will look like we have done something!
I still have the front to wire and enclose. Then if it warms up enough we will put in the roof vent. After that comes insulating, installing lights, and putting up the ceiling panels. If the weather is still nasty, we'll start framing the bed and kitchen cabinets.