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If you are looking to find replacement stainless steel panels, there are several bus wrecking yards around the country where you can purchase used replacement panels. Caylor Supply in Rantoul, KS and U.S. Coach in N.J. comes immediately to mind.
If you are looking to replace the fluted stainless steel with the smooth look, R&M Fiberglass has kits to update not only the front and rear caps but all of the side panels as well.
As far as the door is concerned, R&M has some alternatives but I am curious as to why you want to replace the door. That is unless you have the transit style two piece door. If that is the case I can understand why you want to replace it.