I found a brochure in an old box recently that tells the promotional side of Steel King.  It is fantastic reading!  On the Holiday...

For the Holiday, it says "This model is for the young at heart who like the sunshine and breeze of an open boat yet all the comfort of a cruiser.  Hatches make engine and gear accessible.  The cockpit is self-bailing.  Stern seat is standard equipment.  This boat has speeds up to 35 mph., with power available.  The boat features a one-piece reinforced fiberglass top with wrap-around windshield - plate glass in front of operators.  This two sleeper has flush deck full headroom cabin with twin berths at sitting-height, with matching helmsman and companion seats.  Large storage lockers under bunks and in head.  Private toilet compartment under forward deck."

... and there was a covered deck version as well, the 26' Express Cruiser!

This boat was much more like my father's only his had a hard top and wooden-framed side windows in the cockpit.  The brochure says "This new 26' Express is years ahead in styling and design advancements.  Powered with a single 225 hp. Graymarine V-8, she develops speeds up to 33 m.p.h.  The boat features a one-piece reinforced fiberglass top and wrap-around windshield, with plate glass in front of operator.  After cockpit is one level floor - no step up or down.  Hatches make engine and gear accessible.  A hard top for flying bridge, made of fiber glass, is available as well as canvas top pictured... We offer as standard arrangement this deluxe interior, which is an extra on some competitive models.  This arrangement has full headroom in cabin and head, full-length bunks, dinette, galley storage locker and radio shelf.  There is storage space under the bunks and dinette.  The head has marine toilet and storage locker.  A one-piece, fire proof, fiberglass galley and head counter top with wash basin and sink built-in, adds lasting beauty and durability to your interior."

Here are some construction details...