Very nice, Tom. There are a lot of different ways to tackle this job and accomplish a great end result. And you definitely have a great end result. Your trailer is one of the nicest on the forum.
@Khughes222, if you want that smooth surface for applying paint and don't want to lay up cloth, you can always just roll a few coats of resin on the exterior and sand it smoother than a baby's bottom. A lot of people do that as a method of sealing the exterior of their trailer. You would get the same finish as if you had included cloth, just not the additional strength. But if you're using a thick exterior skin, strength will not be an issue for you. It was for me because my skins are quite thin.
The cloth tape on the roof to wall joint is a good idea though if you are not planning on putting edge trim there. If you just brush on resin that joint could eventually crack and open up from the road vibration and bumps. Cloth tape should eliminate the possibility of that. Of course edge trim is the other possibility and gives the trailer a very nice finished look.
Just keep asking questions and you will get a lot of different suggestions and ideas which will give you many methods to choose from. There is no absolute right or wrong here as long as what you come up with works for you and is safe to pull down the road. There are a lot of beautiful and creative trailers out there, skillfully done in a variety of different ways. Go through the Hall of Fame and when you see a trailer you like, visit the build journal. Check out the Galley Gallery too. There is so much to be learned here. That must be why almost everyone eventually ends up building more than one trailer. There are just too many great ideas to incorporate them all into only one build.