Kings Island's major boneyard is just a little thing to the South of the main maintenance buildings. This would be squeezed in between the parking lot and the railroad turnaround. That said, Kings Island owns LOTS of land, so if components for a new ride come in during the operating season, I'd expect them to be staged near the construction site.
Now, the access road leading to the construction site is a major pain, and probably inaccessible to large construction vehicles. From the maintenance yard, the road crosses the railroad track and then takes a rugged path around the back of the park. From the other side, the road goes over the Top Gun entrance, under Son of Beast, and down into the woods behind the Beast. Also a rugged path to get to the KCKC site. I think that explains the new cut-through beneath The Beast's lift hill...that means that there is now access to the site (when the park is closed) from the midway , through the gate behind Vortex, under The Beast, and right into the site.
I know that when they built Son of Beast, most of the components were apparently staged in the field between the campground and the construction site. So I expect that for the new attraction, when parts start arriving, they will probably stack them up in the woods behind the site. Many park nuts may be seen riding the canyon ride and the train this season, I'll bet...!
--Dave Althoff, Jr.