OP: "Not having a faucet could be a problem when trying to look good for specific people like law enforcement or a nosy neighbor. If it looks like a miniature version of a real house, people will be impressed. If it looks like you just got done with a week of camping during hunting season, anyone looking may take a negative view."
Good luck with that attitude. A. None of those people matter. B. Most of them aren't going to get past the fact that you're living in a van. C. Looking at a nice set-up that probably cost some money will probably attract a certain type of person who will want to see what else you've got of value.
I've traveled many, many miles, and have never attracted the attention of cops except that time when one of my tail lights was out. If you are attracting cops, look carefully at what you're doing, and stop doing it.
You're not going to please everyone, no matter what you do. Build your van to suit yourself.