Here I've tried to do some measurements of the new building, and the connecting tunnel:
View attachment 214042
These are rough estimates but looks like the new building could be around 300' x 220' and at least 100' tall (guessing the height) . The tunnel should be at least 40' wide and will have a length of around 340' from UoE to the coaster building. I suspect this tunnel structure will be elevated above the road so that the coaster enters the building from above then drops down as opposed to RnRc that enters from the bottom and goes up.