The duct work, vents and under dash lines for the AC/Defroster have been interesting. The small distributor is for the Hurricane Heat system, there are 5 of these through out the bus each with its own control.  The dash will be covered with the same ultra leather and padding as the ceiling on a 3/4" plywood base.  The cover for the grill and equipment will be finished cherry plywood 3/4".  The white plastic pipe on the center support for the windshields is the front drain for the roof top heat pumps, there are two drain lines one on each side of the bus with front and rear drains.