Pros:

-Having a Fleshpound for a Charger is a great concept
-Very well done, looks just like a Fleshpound does in Killing Floor
-Having a Fleshpound charge at you and tear you apart is scarier than a charger doing it

Cons:

-doesn't have a yellow glow like they do in Killing Floor (but that's something that would just be a nice bonus)

Conclusion:

This is a very well done skin, one of my favorite games crossing over to another one of my favorite games. Kudos to you.
And if you're looking for skin ideas you should do:
1) Crawler as the Hunter
2) Bloat as the Boomer
3) Maybe the Scrake as the Tank?
4) Clots as the Common Infected?(don't know if that's a difficult one to do or not)
5) Siren as the Witch
Basically a Killing Floor scheme for L4D2's gameplay.