Just created an account to say that I am absolutely in for Case A.  That's pretty much the thing holding me back from grabbing a Planck, I love high profile cases and that one fits the bill.  If you can offer it annodized, or raw I would be elated!
As for keeping the case oily, if it were steel I would say that helps for rust prevention, but for an aluminum case, I'm not quite sure.  I'm an electrical engineer, not a mechanical so I can't help too much here! Sorry!