I'm not sure what I will use it for but I just wanted to see the image I have been thinking of for the last few days. I might build a 8x8 or 8x12 for a grow out pen. I think I might run a wire skirt around the base to keep coons from digging.
i like your handle on one end, I need to do that to the similar sized tractor i built last year. I used lighter materials ( 2 x 2s). I was surprised at how heavy it was to move. so my advice is to buy good tires, I put on some push lawnmower tires that i had in the garage and its too hard to move easily.