Here are a couple examples of field wagons from searching the web. Interestingly some of the first images that are returned are those from one of the other kits out there.
I know, the paint still needs work! The model however, IMHO, looks pretty tight. I believe that it is pretty close to the right dimensions though some allowances were still made for the small scale. I have some horses on order and will update this post and the wagon once I have them in hand.