Well I had a closer look at the field bin and it's BIG. The second thing which is good is the lower cone is bolted on, so removal will be a cinch, so a lower level is a possibility because the bin is about 4 meters high. I haven't done a ground to peak measurement yet but that's a fare estimate. The top cone is also bolted on so modification to make it turn is also possible.
I will start drawing up a plan & see if this boat will float..
