To answer the original question, all of the 23 IKSS model years have the island in the kitchen. That is the "IK" in the 23IKSS model name. The SS stands for Super Slideout or something like that.
The original IKSS models had cabinet doors on all four sides. Then after a year or two they changed to just doors on the oven side and the dinette side. That's what our early 2015 has. More recently, they made the island cabinets a little smaller and now there are only doors on the oven side.
Hope this helps. Great floor plan.
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2015 Shamrock 23IKSS
2008 Ford Expedition EL