WOW !!! Excellent build of a very unusual vehicle...boom and rigging are superb...zimm and scheme are top-notch...is that an AM conversion? I predict that you will do very well in competition...
Some things (very minor) for your consideration: tow rope has some noticable fuzz on it...the weld seams on the interlocking plates could really benefit from some more pin-washes...the running gear could use a little more dust/dirt...the wooden box on the back deck is very dark; weathered wood gets lighter (turns eventually to a grey)--maybe a tan drybrushing would make it "pop" a bit...
Overall, I give this a big WOW !!!