The workmanship looks to be excellent. Congratulations on a fine job.
However, I don't understand why you did not install a tongue jack by now. Also, if this is supposed to be for hauling around a lawn or garden tractor, why are there no tie-down rings recessed into the floor. If it is also supposed to be a general purpose trailer, then why is there no outside rail for tie downs to grab onto, all the way around the trailer because no matter what you put in that bed, it must secured.
It would also be a good idea to state the length and width of the actual floor of the trailer along with how high the floor is off the ground when the trailer is hooked to a vehicle and is level.