Doug,
Your CW material is probably not Westinghouse micarta if it's indeed linen. Westinghouse micarta aka Ivorite was a paper laminate. Your model #5 with a 1/4" tang will require a block of 1-1/8" X 1-1/4" X 4-3/4". CW specs must be within 1/8" of requirements. Your piece of micarta measuring 1+1/4" x 1+3/4" x 5+1/4" will need some triming.
On a lighter note, Bo Randall once said:
"GM has a factory, Randall is a knife shop "