I've been putting my NE arms and legs together this week. I'm having great success in using CA glue inside the seams.
First I mate up all the seams with painters tape across. Once its tight I put some tape down the seam. Then I cut the extra ABS and make it fit in the ridges. I clamp down one end, run my finger down the seam/ shim and quickly clamping down the other end.
When its ready just sand down any parts of the seams that are uneven. This way you can lay down your cover strips easy.
Good luck!