Looks like I will be building a small Shepherders Style Wagon. Styling! Suggestions needed?

My mind works bass akwards sometimes but I think this might be a good project for me right now. I found the foundation trailer today and have the money. So that’s half of it right there. And it’s only $500. It’s a 4x8 utility trailer that already has partial steel framed walls going up about 2 feet.
 So this might not be like other Shepherder wagons. In fact be not studied them closely enough yet. Has anyone built one or got ideas?. I’m excited. I need something focused to get my mind off this pandemic thing.
 I have a lovely piece of white epdm rubber roofing to cover it with.
 I’m thinking of building a cedar box down each side above the fender wells. This will be extra storage and make it 6’ wide rather than 4’ wide. The roof will attach to the box which bolts to the steel posts which are welded to the trailer frame. Does this make sense?  It sounds pretty strong to me.
Curved plywood end walls could be notched to hold roof stringers going lengthwise. Quarter inch plywood could be bent over the arches formed by the stringers. Then the epdm goes over the curved plywood for a long lasting watertight roof that’s not exceedingly heavy.  

Here is a example of a custom trailer. What I propose to build has more wood on the sides and the roof doesn’t come so low.

I'll be keeping an eye on this! Can't wait to see it come to fruition! Good luck!

Thanks Carla,
I went and bought the trailer pictured today. It’s got a few dings but is solid. I’ll click some pictures of the process and post them. My goal is to keep it lightweight and small enough that a full size truck is not needed to move it.
The doors to the storage boxes down the side will hinge down to become a table for outside access and cooking, etc. But there will also be access to the storage boxes from the inside.  
Hopefully will buy materials in a few days and it’s going to stretch my budget. I used to have lots of wood now I have very little.

A pinterest account will give you a plentiful plethora of plans on just this project.
FWIW make sure you put the preponderance of weight forward, a balanced trailer or weight to the rear will cause the trailer to"whip" at speed.
One thing I haven't seen is people using solar panels as side box tops,
lacquered white lightweight canvas will make a good top too although it will need replace more often but... light coming thru it is a wonderful greeting in the morning.

Hi Bill,
Thanks for the suggestions. Room for solar panels is a challenge especially with a curved roof so I like the idea to put them on the side boxes. I was thinking of the outside doors of the side boxes swinging down to make a table while cooking outside.
Maybe a hinged awning over the front window could be a solar panel?
This will be minimalist. Not designed for luxury but a few comforts. Whomever uses it can do as much finishing as they want. I’m just building the shell. I’m skilled at framing and construction but my finishing skills need practice.
I hear you about having some tongue weight on the trailer. I had a hay trailer that whipped and it was scary. Previously I’ve adjusted the weight distribution of my trailers by placing heavy cargo in the front and over the axle of the trailer and light cargo in the back. But this doesn’t help when it’s empty so it needs to be built with enough weight forward.
I like the idea of a translucent roof but I’m thinking of some foam insulation. It’s cool and chilly here in the Puget Sound most of the time and a cozy warm space is what I’m thinking of. I’m thinking a few candles will warm it if there’s some foam insulation.