I have a 2014 18EC, and it does indeed have a double bowl sink. And the window is probably twice the size than on the 2013 version.
Mods I've done so far- Watch that first step going outside- it's a lulu- so I installed one of those folding "oh sh**" handles by the door. I also mounted a couple large plastic tote boxes on the generator rack for hoses, extension cords, etc.
The only problem is the camper has no insulation whatsoever in the walls (it's 1" thick plywood with fiberglass gel coat on the outside). Yes, the 13,500 BTU A/C can keep it nice and cool in hot Louisiana summers, but I had a hard time heating it on a recent trip when the temperature only got down into the 40's. Although the A/C has electric heat built into it, it didn't blow warm enough to do any good, so I turned it off. Next, I tried to turn on the gas furnace, but it wouldn't come on. So I pulled out my trusty oil filled electric radiator and finally got it warmed it up in there. But the next morning before leaving, when I went to disconnect the 30 amp service cord, I discovered that the neutral conductor inside the twist-lock plug on the outside of the camper overheated and scorched, melting the plastic and making the plug nearly impossible to remove. I never had a problem using the same electric radiator in my previous camper (a Puma 20QB), but then again the power cable wasn't removable like on the 18EC- it was hard wired. (It stored in a cubby hole on the side.) So now I have to replace the twist lock receptacle, and re-think how I'm going to heat it up in there. If I can't get the gas furnace to work, it'll have to go back to the dealer for warranty repair...