Looking good!
I have concerns about a couple of things though. The first is your shackle setup. Why did you decide not to use any sort of bushing for the shackle mount? I have a feeling this will make a LOT of noise and eventually wear away at itself. Especially in the harsh conditions of Baja. If this was a landscaping trailer to go to Home Depot it might be a different story, although I would still be a bit suspect.
Second is your overload springs. They appear to be upside down. If your leafs go that inverted you have big problems IMO.
Third is your u-bolt plates. Now I realize these won't see the forces that they would on a vehicle(much less articulation on a trailer axle), but I would still brace them so that the u-bolts do not pull them down on the sides. You can do this by simply welding a piece of angle iron across them. If you look under any truck with leaf springs you will notice that the u-bolt plates have bends in them perpendicular to the spring, this is why.
Overall great job though. The frame looks absolutely bomber and I doubt you will have any problems there!
