i'll be mr. pessimistic here and say: save up a couple hundred bucks, sell your trailer for a couple hundred bucks, and you should be able to pick up a used enclosed trailer (5x8 should be light enough to tow with even a car or small SUV) for well under a grand. hell, less than that if you wait for the right deal. add up the materials you have to plunk down money for, your time, and the extreme likelihood of your mad creation blowing away into a million pieces on the highway in the slightest crosswind. you're a lawyer, think of all the fun you'll have responding to law suits from blood thirsty ambulance chasers regarding your rickshaw that self destructed and peppered itself all over the road and into their client's mercedes. i say save up for a few months, and pick up a small enclosed trailer over the winter when the right deal comes along.