FYI, this is copied from the Barb Campaign page, and describes the categories available to the modelers.
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"There are four categories, feel free to submit as many entries in any category.
1. Armor kit built out-of-box. This is a tracked armored vehicle with no aftermarket parts; however, stretched sprue antennas and grab rails are allowed. This is to give people with limited budgets or experience an equal opportunity to participate.
2. Armor kit modified. This is a tracked armored vehicle with any aftermarket accessories or scratch built items added. Kit bashed entries fit this category.
3. Other kit built out-of-box. Any type of half-track, wheeled vehicle, fully tracked truck (i.e. RSO), soldier on horseback, wagon, towed artillery piece or other trailer built with no aftermarket parts beyond the stretched sprue.
4. Other kit modified. As above but with aftermarket accessories, conversion kits or scratch built items added.
A vehicle can be displayed as part of a diorama, on a base or by itself. The category will be whatever is done to the vehicle. Dioramas are not judged, but the vehicle on it will be. After all, this is an Armor group build and not a Diorama group build."
In addition, one campaigner posted lists of German and Russian vehicles appropriate for the campaign----pretty useful info.
Good luck on your builds
Steve