I built a three bent structure with no sills. There is a girt connecting the post about 2' up from the bottom of the post, holding the post together. If this can be at the top of the post why not the bottom? All the post are different length as well, sitting on tires with cement in them, poured from the extra waste at a previous job. These tires sit on foam sip window cut out, in a very wet area. It will actually flood to the tires at times. I have seen little to no movement in the frame. But I have not checked it with any accurate devise other than my eye on passing. The Stall door inside did need adjusting through the winter to latch properly, though.
Tim
