As far as I can tell, the "X's" refer to the 35' HF whips on the bow and stern of the ship. These can be made by "stretching sprue" into thin wire-like pieces. Check a search of this forum for the proper techniques. You can also use stiff wire, and keep in mind on the actual ship, these arrays are 1ft wide at the base and taper to about 6in at the top.
As for the others, it would appear to be the instructions on how to stretch sprue.
A) Snip off section of sprue
B & C) Slowly rotate section of sprue over low heat until slightly maleable
D) Slowly pull sprue apart, creating a "string" of plastic of the appropriate length.
Hope this helps.
demono69