Except for heat. Heat effects do not change physical combat.
So you are looking at:
Piloting
+Actuator damage (Whether leg or arm)
+Range (Always 0, so no change there)
+Attacker movement (0, 1, 2, 3)
+Target movement
+Terrain (eg: Woods, water)
+Weapon modifiers (eg: -2 for a sword, -2 for a kick)
In real world this would look like:
Pilot 5
No actuator damage 0
Range 0
Movement 2 (Ran)
Target 2 (moved for 5 hexes)
Terrain 1 (Target in light woods)
Weapon modifier -2 (Kick)
So 5+2+2+1-2 = 8.