Pues oye, está bastante bien.

Cierto, se me pasó comentar que se puede sacar infinidad de ideas del foro oficial:
http://duxrampant.yuku.com/
 

Bien pensado
He visto que en tu variante de Battle Masters no incluyes el cañón, aquí tienes reglas para poderlo hacer funcionar:

Artillery:

•Use 1 artillery model plus 6 crew (Your Leader can't be part of this unit).
•May be operated so long as 1 crewman is still alive.
•Points cost: 4 points (maximum of 1 artillery piece per Retinue).
•Range: Anywhere within line of sight on the tabletop.
•Shoot value: 7+.
•Damage: Roll 12 dice against the target unit, hitting on 3+. Ignore cover.
•Reload value: 10+. After a successful Shoot action, the artillery may not be fired again until a successful Reload action has taken place. This is carried out as a normal, ordered activation.
•May not move during the game and must be deployed in the player’s deployment zone.
•If contacted, shot at, and for Courage tests, the crew count as Serfs at their current strength (6 models or less).
•The crew must maintain cohesion around the artillery model (not moving more than 3” beyond it).

¿y qué tal unas armas de asedio? (esto empieza a irse de las manos...)

Ladders: @1 point, for Infantry units only.
 The unit is equipped with enough ladders move and battle normal. Units with ladders may attack a (high fortress) wall, same way, as they would attack other obstacles (like fences, smaller walls).

Battering Ram: @2 points, for Infantry units only.
 The unit is equipped with a battering ram, which has a sheltered roof as cover. Unit with 7+ models left, may move normal with the ram, units with 6 or less models left, they ½ movement (so full strength bidowers/men-at-arms can only move it with 1/2 movement).

 Units Armour becomes 4 versus Shooting, and 3 versus Attacks. A battering ram can only be used against entrance gates and wooden walls, but not against stone walls or towers. The unit may attack an entrance or wooden wall in contact, as the basic rules, but add +1 to the Attacker value.
(The entrance or wooden walls have a number of damage points, they can resist, before they are destroyed. The number of damage points is determined per scenario)

 A unit which is forced to retreat or destroyed, left back the battering ram at the current place. Another Infantry unit may crew such a left battering ram with a movement.

Kettle: @2 points, for Infantry units only.
 The unit is equipped with a kettle of hot water (or any else hot fluids) and move as normal. Units may attack any opponent unit or battering ram in direct contact (only separated by the fortress wall), as normal. The attacked units Armor get -2.

Pues unas reglas para un ribadoquín no vendrían mal para una escaramuza Veré si se me ocurre algo y lo posteo acá (a menos que alguien más se me adelante, claro).

Y aquí está el Chariot Rampant para antiguedad

No, es distinto sistema. Pero puedes utilizar cualquier ejército, de papel o con miniaturas, en peanas individuales o grupales.