D28 measurements:
Total guitar length: 1031 mm (40-9/16″)
Back length: 508 mm (20″)
Upper bout width: 291 mm (11-1/2″)
Waist width: 273 mm (10-3/4″)
Lower bout width: 381 mm (15″)
Rib height (including edging) at heel: 99 mm (3-30/32″)
Rib height, at waist: 111 mm (4-5/16″)
Rib height, at end block: 124 mm (4-29/32″)
Head length: 159 mm (6-1/4″)
Head width, top: 72 mm (2-11/16″)
Head width, bottom: 55 mm (2-5/64″)
Neck length (nut to ribs): 358 mm (14-1/8″)
Neck width, nut: 42 mm (1-5/8″)
Neck width, heel: 56 mm (2-3/16″)
Soundhole diameter: 102 mm (4″)
My CE350S from 1980 measures approximately the same, so a Martin D28 case should be suitable for your Cat?s Eyes.