They use a "Box" style construction for the fuse. Light ply on top, bottom, and both sides held apart by the fuse bulkheads. You are instructed to Rubber Band it together, make sure that it's straight and square, then, CA the joints.

The one thing I would like to point out is, (and this goes for all Goldberg kits)

Make SURE that it is both straight AND square!

They have a tendency to go out of square toward the rear. I usually like to tack the bottom down to the building board (with pins or small nails) to hold it flat, Then hold each area square as you tack glue it.

Once it is tack glued together, and double checked for square, then go ahead and glue all of the joints solidly.

Once that is done, remove the pins or nails with a pair of long nose pliers