Actually why it is hard to quote.
The Zip System was designed to lower labor costs. Not my favorite for various reasons, but does lower the labor costs. With the CI, some are going to what we call RZip... which is a rigid insulated panel like a SIP panel without the drywall attached to the inside... it cost more in material, but saves on labor.
So a lot of keeping prices down is balancing labor and material costs through the best building technique to meet the code.
Island is tough, because the weight and size of the material needs to be taken into consideration. An owner travelling back and forth on a regular basis can add a few items each time... but size and weight need to be accounted for.
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