Thanks Guys! I made all of those changes plus the one a kind soul sent me privately. The gas tank capacity on the Sprinters had been wrong.
for the record, that is a 2551. I have full photos of that unit inside and out--dozens of them. It is a 2551. Kudos to Gradygal for figuring it out! This is why I submit things to y'all before I run them up the flag pole for the public.