Never built that kit, but I'm quite used to deal with seam lines on fuselages... My favourite way of doing that is to test-fit first without any glue. You can see straight away where the problems will be. If there are major fit issues, I'll do my best to have the top part of the fuselage as neat as possible, leaving the main mess on the belly, where it's less likely to be noticed!
When I'm ready, I'll use superglue to attach the fuselage halves together. No need to apply glue everywhere, just a various 'strategic' points. I then apply liquid polystyrene glue along the seam, on the outside, and wherever I can reach inside.
I might use masking tape to get a very tight fit.
Let dry for a day or so. Next, inspect your model and see where putty is required. I try to use a little putty as I can becase there's often some shrinkage that appear several days/weeks later and usually when you've painted and decalled.. Instead I use minute amounts of superglue and liberal amounts of accelerator to fill in most or all gaps. Sandpaper/files are applied onto the dried glue as early as possible as superglue keeps getting harder and harder as you wait! The files can leave marks and it is at this point that I'll use putty, preferably one I can remove without any more sanding, with Nail Polish Remover and a rag.
sanding and filing will often fill in or obliterate engraved details or raised ones (panel lines in particular). A fine raised line can be acheived with a sharp blade: lightly pass the blade where the line should be and the trench you create will look like a raised panel line (the cut is too thin, and passing the blade in the plastic has created two ridges that will look like a single raised panel line). Engraved details is just re-engraved, this time using a sharp blade and several passes.
A thin coat of primer will reveal any imperfections. Time to start again, or time to go on with the rest of the model!