On the Warmoth site, if you configure an unfinished body or neck with standard woods, the price seems to come out the same as the Showcase.
But the things which really seem to add to the cost are:
Finishes
"Unique choice" tops or fingerboards
Neck shapes like SRV, Clapton, Wolfgang and '59 Roundback
In the Showcase they don't really pass those costs on - finished bodies are never $185 more than unfinished ones, and an SRV neck will usually be the same price as a standard shape.