Slave driver!
While whipping up the following I realized that the Stomp SQ did not list an ability to determine the Reflex DC. I think we'd better make it Strength-based like a Trample attack, so I've updated it with that.
Wooden Juggernaut
Huge Construct
Hit Dice: 5d10+40 (67 hp)
Initiative: –1 [
?]
Speed: 40 ft. (8 squares)
Armor Class: 13 (–2 size, –1 Dex, +6 natural [
?]), touch 7, flat-footed 13
Base Attack/Grapple: +3/+16 [
?]
Attack: Slam +10 melee (1d8+5) [
?]
Full Attack: 2 slams +10 melee (1d8+5) [
?]
Space/Reach: 15 ft./15 ft.
Special Attacks: Stomp, sweep
Special Qualities: Construct traits, damage reduction 5/—, spiritual equipment
Saves: Fort +1, Ref +0, Will –4
Abilities: Str 20 [
?], Dex 8, Con —, Int —, Wis 1, Cha 1
Skills: —
Feats: Snatch (B) [
?]
Environment: Any
Organization: Solitary
Challenge Rating: [
?]
Treasure: None
Alignment: Always neutral
Advancement: —
Level Adjustment: —
Description.
Background
Combat
Tactics
Spiritual Equipment (Su): See the Guardian Juggernaut template's Special Qualities fo a description of this ability.
Stomp (Ex): A wooden guardian juggernaut can stomp an  opponent two  or more size categories smaller than itself. This is a  special  full-round action during which the juggernaut moves up to twice  its  ground speed and attempts to move into its opponent's space. If the   victim fails a DC 17 Reflex save, the opponent takes 4d8+7 [
?] bludgeoning damage, following which the  juggernaut may either pin or kick the  opponent. If the victim succeeds  at the Reflex save, the victim takes  half damage, the juggernaut's  movement ends next to the opponent's  space, and the opponent may make  an attack of opportunity against the  juggernaut. The save DC is Strength-based.
If the juggernaut pins its opponent, the victim automatically takes   stomp damage during the next round unless the juggernaut moves off them.   If the juggernaut chooses to maintain the pin, treat it as a normal   grapple attack. Pinned opponents continue to take stomp damage each   round if they don’t escape.
If the juggernaut kicks the opponent, the victim travels 1d6 × 10 feet,   and takes 1d6 points of damage per 10 feet traveled plus stomp damage   from the kick.
Sweep (Ex): This special attack allows a guardian juggernaut to sweep its arms* from  side to side as a standard action. The sweep affects a  half-circle  with a radius of the juggernaut's reach, extending from an  intersection  on the edge of the juggernaut's space in any direction.  Creatures  within the swept area are affected if they are two or more  size  categories smaller than the juggernaut. A sweep automatically deals   twice the juggernaut's base slam damage (or claw damage, if the   juggernaut has no slam attacks) plus 1-1/2 times the juggernaut’s   Strength bonus (round down). Affected creatures can attempt Reflex saves   to take half damage (the save DC is Strength-based).
*A guardian juggernaut with a non-standard anatomy can use other limbs, such as wings or a tail, to make a sweep attack.