Please give us the info on where you got the Corian. My husband doesn't know it yet but we are going to duplicate your shelf on our 2350 Sprinter.
We also mounted a satin nickel paper towel holder under the medicine cabinet. Got it at Bed Bath and Beyond. It looks good, matches the knobs and solves the problem of water all over the sink when he shaves and washes his hands.
We tried to send a picture of some of our additions, but had no luck.