Hi Lanrak,
I'm going to have a think on this, and I would ask you how would you adapt your concept if you had to remove this bit;
Eg a unit of 10 soldiers with I 'wound' each will have a DC of 10.(10x1.)
A unit of 5 large monsters with 3 'wounds' each will have a DC of 15.(5 x 3)
Multiple wounds is not something WarSpike is going to have as it does not match any damage model that is 'realistic'. Multiple wounds are tantamount to HP (Hit Points) and I find them very misleading.
What follow is an explanation of sorts, as I don't like to reject something without giving reasons

Although this will get into a discussion about damage (a new topic maybe?), to sum up a sword thrust to the solar plexus which results in a 2" stab wound is lethal, against an Ogre (Ogryn) or other large humanoid this may increase to 4". The point is that the wound will kill just the same, and the amount of force between 2" and 4" through flesh is not that much and well within the abilities of a regular human warrior. If a beast was so large that the full length of the sword would not kill it, then it's pretty much immune - you could stab it 10 times in the same spot and it still wouldn't reach the vitals.
Same goes for lopping off arms: if the blow can break the bone it can remove the limb, if the limb is so thick (like an Ogryn's forearm) that the bone can not be broken, multiple blows will not cut it off - and considering the setting the attacker isn't going to get that many goes!
Any warrior that wishes to kill is going for areas that are critical.
The main strength of an Ogryn is not resistance to piecing impacts but they can wear some pretty heavy armour. In bare fist fights where the critical areas can not be destroyed so easily by a regular humans an Orgyn is going to be
really tough.
To my mind the only time HP could make any kind of sense is in a Boxing match (with gloves) but even then I think there are better ways and HP would be secondary and more like fatigue, blood loss or baffle. I think it is a mistake to use Boxing as a basis of sword combat or firearm combat - human are very vulnerable to weapons.
I think the idea of HP with swords in historic games only come about because people actually believe that knights tried to hack through armour with swords (which they did not - grapple at the sword or morte-strike (to stun)), and bludgeon weapons were more about stunning to allow a finish that tying to kill the man where they stand. Most knights die via daggers/ spikes or via huge two handed weapons.
Because most armed conflicts are about stun and finish or grapple and finish, it seems a better idea to be able to work out stuns, holds and death. In combat - stun/ hold = finished.
As for defence, knights wore armour in case they got hit, not to allow themselves to be hit (allowing themselves to be hit would result in a stun and that leads to death). Armour is used to ride/ deflect blows that get past the guard. The guard is the number one defence (and it's
very good!) As in all things; armour is only as good as the person wearing it (a person with no guard will get hit, stunned and taken down)
This roughly covers why I will resist the idea of multiple wounds or hit points in regard to armed combat. I prefer to think of other was to represent less effective weapons which can not kill outright.
For example a .38 (double action revolvers in .38 Long Colt) has a hard time killing in some cases because it causes a smaller trauma than a .45, and has to really hit a vital area smack to stop a target. To my mind this equate to a reduction in target area. A negative modifier to the 'hit roll' would suffice. This is not to say it makes actually hitting the target harder, but hitting a vital area harder. If a person has a pistol and a point shoot skill of 5 and armed with a .38 for -2 then the kill would be 3 or less (5-3)
but a roll of 4 and 5
still hit. Such a hit may stun, but if a person was pumped up then it may not stun at all (frenzy to ignore!). This allows us to model conflicts such as Moro Rebellion. The .38 can kill easily if it hit something vital, even a .22 will kill to the back of the head.
No damage rolls, no wounds and no HP!

Can you work around/ with that stipulation?

Philip