Absolutely beautiful; kit. personally I'd be more inclined to worry about the decals. As for Sub assemblies I would do the wings first and get the decals well set down and weathering done.
I don't have any photos of theh one I done as It sold quickly and I have another two.
So to answer properly, get each wing section complete before assembling the "X" then you should be on the way.
Good luck and please post photos, I'm really interested in how people approach thisd kit.
Terry.