Good find, Lady DF...
Although I think the template is a great place to start for builds (both vamp and skinwalker), it doesn't quite capture the power-levels that the Cullens (and by extension, the wolves) were exhibiting in the films, which I saw 3 weeks ago...lost a bet to the same cousin, and that was my "payment" to her.
Any-who...I would absolutely increase the speed and strength levels on the vampire template to reflect some of the prowess levels I mentioned in my previous post about the SkinWalkers. Obviously, the Cullens are very strong and fast, and I'll give some examples of each:
Twilight 1: Edward saves Bella from being smashed by an oncoming compact-van (approx 5000lbs or 2.5 Tons), and does so with one hand, while from a crouching position. To get a feeling for the strength requirement to do that, have someone lean on you while you try to support them with only one hand from a crouching position.
Breaking Dawn: The Cullens, (some weakened by hunger, some not) are trying to fight off the wolves without killing them (Carlyle says, "We will NOT be the ones to break the treaty") so they are throwing and punching these creatures through the air as if I were throwing a 15lb medicine ball, all while "holding back." Now, I am capable can lift and press 150lbs above my head, so on the M&M 2nd ed. Strength chart that puts me at a Str14. The wolves are roughly 1.5x the size of a full grown BEAR, which weighs anywhere between 1200 to 1600lbs. Let's go back to the strength chart in the 2nd edition Core Rule book and use a ratio correlation:
An athletic human, with a "Heavy Load" carrying capacity of 150lbs (STR 14) can throw 15lbs approx 25ft. So, a being that can throw 1200lbs 25ft, would have an "overhead pressing strength" by a factor of about 80x that, or a "Heavy Load" Carrying capacity of AT LEAST 6 Tons, or a Carrying STR of 45. So in looking at the build referenced on JDs thread, there needs to be an adjustment, in my humble opinion.
Let's go to speed: It's really hard to get a definitive indication on the velocity capability of either vamp or wolf based on what we see by the movies. The wolves claim that they are faster than the vampires (In New Moon, one of Jacob's pack brothers says so when Bella is with them at Sam's place). We also see Laurent getting caught from behind when they catch him and kill him, as well as the redhead (VICTORIA! That was her name) "Fleeing for the ocean" when the wolves are chasing, and catching up to her, in the forest. Since the films portray the vampires, and thus the wolves, as able to move faster than the eye can follow, my "guess-timate" is that they are moving at a rate of speed greater than 250mph, but let's see if our math can help us again:
*In Breaking Dawn, we see Edward and Bella jumping into the water from a high cliff, and then Edward submerges and immediately breaks the surface again about 25 yards ahead of Bella. So, with a swimming speed of 25yards per second, that puts him at an underwater swimming speed of @50mph (51.13mph). A humanoid without fins, swimming underwater can move at "casual speed" of 1mph without really exerting themselves. So Edward, at a casual pace (the dude wasn't swimming for his life or anything), moves 25X faster than a human. So a casual running speed for an athletic human is about 6 to 7mph (most trained runners can hold that for 1.5 to 2hrs). So given their metahuman abilities (speed, stamina, strength, etc), I think it is safe to say that all the Cullens have a "land cruising speed" of roughly 170mph, and can probably run at accelerated pace for at least 30mins at 350mph, and an all out sprint close to 600mph...we'll assume that Edward is even faster than that. Per the M&M 2nd Ed. movement rules, a being able to casually move at 150mph, can move at 300mph out of combat, and do an "all out sprint" at 600mph; that is usually attributed with a SuperSpeed, or Speed 4 or 5.
SO...all of that to say that when stating up the vampires (and SkinWalkers in wolf form), I would give a base STR score of at least 30, with two or three SuperStrength ranks thrown in for good measure, as well as a SuperSpeed 4 or 5 for the Cullens and a Speed 5 and initiative bonuses for the Wolves. I would also build a multi-form in with each SkinWalker, ie Jacob Black, because they are not as powerful in their human forms. Apparently the books say Jacob can run at a top speed of 75mph and lift/press @1000lbs in his human form. I would also acknowledge Edwards "superior speed" by building him with a Super-Speed 6 or 7.
So there it is in a nutshell...hope you enjoyed the read!