Ok, The first thing to do is like I said before, to clean up those fuselage joints before the super glue gets too hard. When there reasonable, glue the spine on in as good a alignment as you can. That second to last picture didn't look to bad. Tack it in a number of places and don't worry if there's is still a gap like in that picture. When the glue has set fill in the gaps with slivers of plastic card wedged in and then run in some liquid cement. give it a good day to set then carefully trim off the excess card with a curved xacto. Don't worry about getting too close as next you will be filing it flush with a needle file. I would use the one thats curved on one side and flat on the other and tapered to a point. use the curved side holding the file at about a 20 degree angle tothe joint kinda rolling it as you work the joint. you might have to take down the plastic on one side or the other quite a bit depending how well things line up. May take some time. When its reasonably flush, fill in dips and holes with filler and file again. Its going to be a lot of work and there won't be much surface detail in the area when your done, but that can be scribed back later.