Congrats on the trailer!!! I believe the roof will be a rubber roof. The fresh water tank should be below the floor, if you have an enclosed underbelly you will have to remove that to see it. If not you will be able to lay under the trailer and see it. As far as the build time goes, i would guess it depends on how much of a back log the factory has. You might be able to call CrossRoads for that answer.