1/4" Red Oak skin clamped on temporary to rout the door and window opening.
Some might ask. Why didn't I wait to rout the window and door opening til after the skin was glued on?
I did it this way, so I would know exactly where I could staple the skin along the edge of the openings, while gluing it and clamping it on. It was actually easier for me.
Then holding a scrap piece of poplar on backside of skin, I moved the scrap piece along with the router, using a flush router bit. I routed the back radius of the skin (Over sized)
All routed to size, ready to remove and glue on..
Glued skin on using PL Premium, used a laminate roller to make sure there was good contact with the glue. Clamped and then stapled with wide crown staples every where that would be covered by wood trim later. (Not to blow through the 1/4" plywood, I used a low air setting with regulator)
Will let this dry over night. Tomorrow will do the front half of the skin.. and start on the other side..
The gap showing at the bottom of the skin will get a filler piece of red oak. Part of it will be covered with the wood trim that goes on to cover the trailer.
Later I will frame out the red oak with 3/4" x 3 1/2" or 3/4"x 4 wood and around the windows and the door.
Debating on finishing the red oak clear or staining. Wondering if I should do clear on the panels with stained oak for the trim, or visa versa. Or use a different species of wood entirely for the trim.
The top of this tear is going to be PMF'd and painted (color to be determined later).
Anyone have any suggestions what they think would look the best?
might see campable in near future.. 
.. now it's moved back into the smaller shop.. did do some rearranging in the shop before the move.. so a lot better access all the way around the tear to work on it.. 