[If I had it to do over again I would have used sheet metal siding instead of wood]




Your trailer is looking real good, you've done a great job. as for the wood finish, You can still fix that if you wish.
My trailer is made of plywood also, but I am covering it with prepainted aluminum that I purchase from the home renovation center. I start from the back and on forward by overlapping a bit. The way I attach it, Is to use aluminum pop rivets.
Since I'm in the process of doing it now, I can take a few photos and show you how and the finish.